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4.0 Cracked Head??
I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after
many visits to the dealer and local mechanics, it turns out the head was cracked. The head was replaced at 30,000 miles this past July. The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level dropping yet again. Does anyone know what the flaw is, and why these heads crack so easily???? |
Re: 4.0 Cracked Head??
On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net>
wrote: >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after >many visits to the dealer and local mechanics, it turns out the head was >cracked. The head was replaced at 30,000 miles this past July. > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level >dropping yet again. > >Does anyone know what the flaw is, and why these heads crack so easily???? Never heard of it. |
Re: 4.0 Cracked Head??
On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net>
wrote: >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after >many visits to the dealer and local mechanics, it turns out the head was >cracked. The head was replaced at 30,000 miles this past July. > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level >dropping yet again. > >Does anyone know what the flaw is, and why these heads crack so easily???? Never heard of it. |
Re: 4.0 Cracked Head??
On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net>
wrote: >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after >many visits to the dealer and local mechanics, it turns out the head was >cracked. The head was replaced at 30,000 miles this past July. > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level >dropping yet again. > >Does anyone know what the flaw is, and why these heads crack so easily???? Never heard of it. |
Re: 4.0 Cracked Head??
"Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message
news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > wrote: > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > >many visits to the dealer and local mechanics, it turns out the head was > >cracked. The head was replaced at 30,000 miles this past July. > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level > >dropping yet again. > > > >Does anyone know what the flaw is, and why these heads crack so easily???? > > Never heard of it. Are you sure the new head is definitely cracked this time, or could it be just a bad head gasket? Just a thought. A bad head gasket would be more likely to allow the loss of coolant from the water jacket into the combustion chamber(s) or outside the engine more likely than a cracked head would. At least it's where I would start looking first after inspecting all other cooling system components. Just my $.02 . Regards, GK |
Re: 4.0 Cracked Head??
"Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message
news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > wrote: > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > >many visits to the dealer and local mechanics, it turns out the head was > >cracked. The head was replaced at 30,000 miles this past July. > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level > >dropping yet again. > > > >Does anyone know what the flaw is, and why these heads crack so easily???? > > Never heard of it. Are you sure the new head is definitely cracked this time, or could it be just a bad head gasket? Just a thought. A bad head gasket would be more likely to allow the loss of coolant from the water jacket into the combustion chamber(s) or outside the engine more likely than a cracked head would. At least it's where I would start looking first after inspecting all other cooling system components. Just my $.02 . Regards, GK |
Re: 4.0 Cracked Head??
"Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message
news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > wrote: > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > >many visits to the dealer and local mechanics, it turns out the head was > >cracked. The head was replaced at 30,000 miles this past July. > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level > >dropping yet again. > > > >Does anyone know what the flaw is, and why these heads crack so easily???? > > Never heard of it. Are you sure the new head is definitely cracked this time, or could it be just a bad head gasket? Just a thought. A bad head gasket would be more likely to allow the loss of coolant from the water jacket into the combustion chamber(s) or outside the engine more likely than a cracked head would. At least it's where I would start looking first after inspecting all other cooling system components. Just my $.02 . Regards, GK |
Re: 4.0 Cracked Head??
If your first one failed from overheating you may also have warped the
block, causing gasket failure on your second one,which is losing the coolant and may have cracked/warped the cylinder head. (I'm assuming you know that the best way to crack a cylinder head is to pour cold water into the hot engine when you notice that the coolant is low, but I thought I'd mention it just for completeness :-)). Dave Milne, Scotland "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > wrote: > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > >many visits to the dealer and local mechanics, it turns out the head was > >cracked. The head was replaced at 30,000 miles this past July. > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level > >dropping yet again. > > > >Does anyone know what the flaw is, and why these heads crack so easily???? > > Never heard of it. |
Re: 4.0 Cracked Head??
If your first one failed from overheating you may also have warped the
block, causing gasket failure on your second one,which is losing the coolant and may have cracked/warped the cylinder head. (I'm assuming you know that the best way to crack a cylinder head is to pour cold water into the hot engine when you notice that the coolant is low, but I thought I'd mention it just for completeness :-)). Dave Milne, Scotland "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > wrote: > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > >many visits to the dealer and local mechanics, it turns out the head was > >cracked. The head was replaced at 30,000 miles this past July. > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level > >dropping yet again. > > > >Does anyone know what the flaw is, and why these heads crack so easily???? > > Never heard of it. |
Re: 4.0 Cracked Head??
If your first one failed from overheating you may also have warped the
block, causing gasket failure on your second one,which is losing the coolant and may have cracked/warped the cylinder head. (I'm assuming you know that the best way to crack a cylinder head is to pour cold water into the hot engine when you notice that the coolant is low, but I thought I'd mention it just for completeness :-)). Dave Milne, Scotland "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > wrote: > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > >many visits to the dealer and local mechanics, it turns out the head was > >cracked. The head was replaced at 30,000 miles this past July. > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant level > >dropping yet again. > > > >Does anyone know what the flaw is, and why these heads crack so easily???? > > Never heard of it. |
Re: 4.0 Cracked Head??
wot he said. Is there any steam coming out of the exhaust ?
As another thought, have you ruled out the water pump leaking ? That would be my first port of call. Dave Milne, Scotland "GK" <nospam@nospam.com> wrote in message news:uPzQb.10796$6o4.6637@fe2.texas.rr.com... > Are you sure the new head is definitely cracked this time, or could it be > just a bad head gasket? Just a thought. A bad head gasket would be more > likely to allow the loss of coolant from the water jacket into the > combustion chamber(s) or outside the engine more likely than a cracked head > would. At least it's where I would start looking first after inspecting all > other cooling system components. Just my $.02 . > > Regards, |
Re: 4.0 Cracked Head??
wot he said. Is there any steam coming out of the exhaust ?
As another thought, have you ruled out the water pump leaking ? That would be my first port of call. Dave Milne, Scotland "GK" <nospam@nospam.com> wrote in message news:uPzQb.10796$6o4.6637@fe2.texas.rr.com... > Are you sure the new head is definitely cracked this time, or could it be > just a bad head gasket? Just a thought. A bad head gasket would be more > likely to allow the loss of coolant from the water jacket into the > combustion chamber(s) or outside the engine more likely than a cracked head > would. At least it's where I would start looking first after inspecting all > other cooling system components. Just my $.02 . > > Regards, |
Re: 4.0 Cracked Head??
wot he said. Is there any steam coming out of the exhaust ?
As another thought, have you ruled out the water pump leaking ? That would be my first port of call. Dave Milne, Scotland "GK" <nospam@nospam.com> wrote in message news:uPzQb.10796$6o4.6637@fe2.texas.rr.com... > Are you sure the new head is definitely cracked this time, or could it be > just a bad head gasket? Just a thought. A bad head gasket would be more > likely to allow the loss of coolant from the water jacket into the > combustion chamber(s) or outside the engine more likely than a cracked head > would. At least it's where I would start looking first after inspecting all > other cooling system components. Just my $.02 . > > Regards, |
Re: 4.0 Cracked Head??
Thanks Guys,
I will look into these things. Just to answer your questions, I have seen no external leaks, all looks clean. From the last time, it has never overheated. THanks for all ur input. Hopefully it turns out to be something minor. "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > If your first one failed from overheating you may also have warped the > block, causing gasket failure on your second one,which is losing the coolant > and may have cracked/warped the cylinder head. (I'm assuming you know that > the best way to crack a cylinder head is to pour cold water into the hot > engine when you notice that the coolant is low, but I thought I'd mention it > just for completeness :-)). > > Dave Milne, Scotland > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > wrote: > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > > >many visits to the dealer and local mechanics, it turns out the head was > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > level > > >dropping yet again. > > > > > >Does anyone know what the flaw is, and why these heads crack so > easily???? > > > > Never heard of it. > > |
Re: 4.0 Cracked Head??
Thanks Guys,
I will look into these things. Just to answer your questions, I have seen no external leaks, all looks clean. From the last time, it has never overheated. THanks for all ur input. Hopefully it turns out to be something minor. "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > If your first one failed from overheating you may also have warped the > block, causing gasket failure on your second one,which is losing the coolant > and may have cracked/warped the cylinder head. (I'm assuming you know that > the best way to crack a cylinder head is to pour cold water into the hot > engine when you notice that the coolant is low, but I thought I'd mention it > just for completeness :-)). > > Dave Milne, Scotland > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > wrote: > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > > >many visits to the dealer and local mechanics, it turns out the head was > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > level > > >dropping yet again. > > > > > >Does anyone know what the flaw is, and why these heads crack so > easily???? > > > > Never heard of it. > > |
Re: 4.0 Cracked Head??
Thanks Guys,
I will look into these things. Just to answer your questions, I have seen no external leaks, all looks clean. From the last time, it has never overheated. THanks for all ur input. Hopefully it turns out to be something minor. "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > If your first one failed from overheating you may also have warped the > block, causing gasket failure on your second one,which is losing the coolant > and may have cracked/warped the cylinder head. (I'm assuming you know that > the best way to crack a cylinder head is to pour cold water into the hot > engine when you notice that the coolant is low, but I thought I'd mention it > just for completeness :-)). > > Dave Milne, Scotland > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > wrote: > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > > >many visits to the dealer and local mechanics, it turns out the head was > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > level > > >dropping yet again. > > > > > >Does anyone know what the flaw is, and why these heads crack so > easily???? > > > > Never heard of it. > > |
Re: 4.0 Cracked Head??
Any mayo in the oil, John ?
Dave Milne, Scotland "John Stio" <jstio@optonline.net> wrote in message news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > Thanks Guys, > > I will look into these things. > Just to answer your questions, I have seen no external leaks, all looks > clean. > > From the last time, it has never overheated. > > THanks for all ur input. Hopefully it turns out to be something minor. > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > If your first one failed from overheating you may also have warped the > > block, causing gasket failure on your second one,which is losing the > coolant > > and may have cracked/warped the cylinder head. (I'm assuming you know that > > the best way to crack a cylinder head is to pour cold water into the hot > > engine when you notice that the coolant is low, but I thought I'd mention > it > > just for completeness :-)). > > > > Dave Milne, Scotland > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > wrote: > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > after > > > >many visits to the dealer and local mechanics, it turns out the head > was > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > > level > > > >dropping yet again. > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > easily???? > > > > > > Never heard of it. > > > > > > |
Re: 4.0 Cracked Head??
Any mayo in the oil, John ?
Dave Milne, Scotland "John Stio" <jstio@optonline.net> wrote in message news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > Thanks Guys, > > I will look into these things. > Just to answer your questions, I have seen no external leaks, all looks > clean. > > From the last time, it has never overheated. > > THanks for all ur input. Hopefully it turns out to be something minor. > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > If your first one failed from overheating you may also have warped the > > block, causing gasket failure on your second one,which is losing the > coolant > > and may have cracked/warped the cylinder head. (I'm assuming you know that > > the best way to crack a cylinder head is to pour cold water into the hot > > engine when you notice that the coolant is low, but I thought I'd mention > it > > just for completeness :-)). > > > > Dave Milne, Scotland > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > wrote: > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > after > > > >many visits to the dealer and local mechanics, it turns out the head > was > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > > level > > > >dropping yet again. > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > easily???? > > > > > > Never heard of it. > > > > > > |
Re: 4.0 Cracked Head??
Any mayo in the oil, John ?
Dave Milne, Scotland "John Stio" <jstio@optonline.net> wrote in message news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > Thanks Guys, > > I will look into these things. > Just to answer your questions, I have seen no external leaks, all looks > clean. > > From the last time, it has never overheated. > > THanks for all ur input. Hopefully it turns out to be something minor. > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > If your first one failed from overheating you may also have warped the > > block, causing gasket failure on your second one,which is losing the > coolant > > and may have cracked/warped the cylinder head. (I'm assuming you know that > > the best way to crack a cylinder head is to pour cold water into the hot > > engine when you notice that the coolant is low, but I thought I'd mention > it > > just for completeness :-)). > > > > Dave Milne, Scotland > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > wrote: > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > after > > > >many visits to the dealer and local mechanics, it turns out the head > was > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > > level > > > >dropping yet again. > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > easily???? > > > > > > Never heard of it. > > > > > > |
Re: 4.0 Cracked Head??
My local mechanic told me that this is a common problem in the Jeep 4.0.
That he has seen it and repaired it many times. After having the head replaced, and obviousely the head gasket, it had been fine, coolant level stayed normal. There are no signs of coolant in the oil, or leaking externally. The other odd thing is, it does not blow excessive smoke. On a pressure test, the cooling system will hold pressure just fine. According to my Mechanic, the crack in the head causes the coolant to leak into the cylinder after the vehicle is turned off. Basically i lose about an Overflows worth of coolant over a month or so. I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, i should not be going on my third head. "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > Any mayo in the oil, John ? > > Dave Milne, Scotland > > "John Stio" <jstio@optonline.net> wrote in message > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > Thanks Guys, > > > > I will look into these things. > > Just to answer your questions, I have seen no external leaks, all looks > > clean. > > > > From the last time, it has never overheated. > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > If your first one failed from overheating you may also have warped the > > > block, causing gasket failure on your second one,which is losing the > > coolant > > > and may have cracked/warped the cylinder head. (I'm assuming you know > that > > > the best way to crack a cylinder head is to pour cold water into the hot > > > engine when you notice that the coolant is low, but I thought I'd > mention > > it > > > just for completeness :-)). > > > > > > Dave Milne, Scotland > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > > wrote: > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > > after > > > > >many visits to the dealer and local mechanics, it turns out the head > > was > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > coolant > > > level > > > > >dropping yet again. > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > easily???? > > > > > > > > Never heard of it. > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
My local mechanic told me that this is a common problem in the Jeep 4.0.
That he has seen it and repaired it many times. After having the head replaced, and obviousely the head gasket, it had been fine, coolant level stayed normal. There are no signs of coolant in the oil, or leaking externally. The other odd thing is, it does not blow excessive smoke. On a pressure test, the cooling system will hold pressure just fine. According to my Mechanic, the crack in the head causes the coolant to leak into the cylinder after the vehicle is turned off. Basically i lose about an Overflows worth of coolant over a month or so. I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, i should not be going on my third head. "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > Any mayo in the oil, John ? > > Dave Milne, Scotland > > "John Stio" <jstio@optonline.net> wrote in message > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > Thanks Guys, > > > > I will look into these things. > > Just to answer your questions, I have seen no external leaks, all looks > > clean. > > > > From the last time, it has never overheated. > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > If your first one failed from overheating you may also have warped the > > > block, causing gasket failure on your second one,which is losing the > > coolant > > > and may have cracked/warped the cylinder head. (I'm assuming you know > that > > > the best way to crack a cylinder head is to pour cold water into the hot > > > engine when you notice that the coolant is low, but I thought I'd > mention > > it > > > just for completeness :-)). > > > > > > Dave Milne, Scotland > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > > wrote: > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > > after > > > > >many visits to the dealer and local mechanics, it turns out the head > > was > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > coolant > > > level > > > > >dropping yet again. > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > easily???? > > > > > > > > Never heard of it. > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
My local mechanic told me that this is a common problem in the Jeep 4.0.
That he has seen it and repaired it many times. After having the head replaced, and obviousely the head gasket, it had been fine, coolant level stayed normal. There are no signs of coolant in the oil, or leaking externally. The other odd thing is, it does not blow excessive smoke. On a pressure test, the cooling system will hold pressure just fine. According to my Mechanic, the crack in the head causes the coolant to leak into the cylinder after the vehicle is turned off. Basically i lose about an Overflows worth of coolant over a month or so. I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, i should not be going on my third head. "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > Any mayo in the oil, John ? > > Dave Milne, Scotland > > "John Stio" <jstio@optonline.net> wrote in message > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > Thanks Guys, > > > > I will look into these things. > > Just to answer your questions, I have seen no external leaks, all looks > > clean. > > > > From the last time, it has never overheated. > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > If your first one failed from overheating you may also have warped the > > > block, causing gasket failure on your second one,which is losing the > > coolant > > > and may have cracked/warped the cylinder head. (I'm assuming you know > that > > > the best way to crack a cylinder head is to pour cold water into the hot > > > engine when you notice that the coolant is low, but I thought I'd > mention > > it > > > just for completeness :-)). > > > > > > Dave Milne, Scotland > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > > wrote: > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > > after > > > > >many visits to the dealer and local mechanics, it turns out the head > > was > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > coolant > > > level > > > > >dropping yet again. > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > easily???? > > > > > > > > Never heard of it. > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
I'll just chime in with the others and agree that cracked heads are
definitely not common on the 4.0L engine. I've actually not even heard of that happening myself though that's certainly not to say it can't or doesn't happen. Jerry -- Jerry Bransford To email, remove 'me' from my email address N6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "John Stio" <jstio@optonline.net> wrote in message news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > My local mechanic told me that this is a common problem in the Jeep 4.0. > That he has seen it and repaired it many times. > > After having the head replaced, and obviousely the head gasket, it had been > fine, coolant level stayed normal. > > There are no signs of coolant in the oil, or leaking externally. The other > odd thing is, it does not blow excessive smoke. On a pressure test, the > cooling system will hold pressure just fine. > > According to my Mechanic, the crack in the head causes the coolant to leak > into the cylinder after the vehicle is turned off. Basically i lose about an > Overflows worth of coolant over a month or so. > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, i > should not be going on my third head. > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > Any mayo in the oil, John ? > > > > Dave Milne, Scotland > > > > "John Stio" <jstio@optonline.net> wrote in message > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > Thanks Guys, > > > > > > I will look into these things. > > > Just to answer your questions, I have seen no external leaks, all looks > > > clean. > > > > > > From the last time, it has never overheated. > > > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > If your first one failed from overheating you may also have warped the > > > > block, causing gasket failure on your second one,which is losing the > > > coolant > > > > and may have cracked/warped the cylinder head. (I'm assuming you know > > that > > > > the best way to crack a cylinder head is to pour cold water into the > hot > > > > engine when you notice that the coolant is low, but I thought I'd > > mention > > > it > > > > just for completeness :-)). > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > > > wrote: > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > > > after > > > > > >many visits to the dealer and local mechanics, it turns out the > head > > > was > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > coolant > > > > level > > > > > >dropping yet again. > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > easily???? > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
I'll just chime in with the others and agree that cracked heads are
definitely not common on the 4.0L engine. I've actually not even heard of that happening myself though that's certainly not to say it can't or doesn't happen. Jerry -- Jerry Bransford To email, remove 'me' from my email address N6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "John Stio" <jstio@optonline.net> wrote in message news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > My local mechanic told me that this is a common problem in the Jeep 4.0. > That he has seen it and repaired it many times. > > After having the head replaced, and obviousely the head gasket, it had been > fine, coolant level stayed normal. > > There are no signs of coolant in the oil, or leaking externally. The other > odd thing is, it does not blow excessive smoke. On a pressure test, the > cooling system will hold pressure just fine. > > According to my Mechanic, the crack in the head causes the coolant to leak > into the cylinder after the vehicle is turned off. Basically i lose about an > Overflows worth of coolant over a month or so. > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, i > should not be going on my third head. > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > Any mayo in the oil, John ? > > > > Dave Milne, Scotland > > > > "John Stio" <jstio@optonline.net> wrote in message > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > Thanks Guys, > > > > > > I will look into these things. > > > Just to answer your questions, I have seen no external leaks, all looks > > > clean. > > > > > > From the last time, it has never overheated. > > > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > If your first one failed from overheating you may also have warped the > > > > block, causing gasket failure on your second one,which is losing the > > > coolant > > > > and may have cracked/warped the cylinder head. (I'm assuming you know > > that > > > > the best way to crack a cylinder head is to pour cold water into the > hot > > > > engine when you notice that the coolant is low, but I thought I'd > > mention > > > it > > > > just for completeness :-)). > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > > > wrote: > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > > > after > > > > > >many visits to the dealer and local mechanics, it turns out the > head > > > was > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > coolant > > > > level > > > > > >dropping yet again. > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > easily???? > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
I'll just chime in with the others and agree that cracked heads are
definitely not common on the 4.0L engine. I've actually not even heard of that happening myself though that's certainly not to say it can't or doesn't happen. Jerry -- Jerry Bransford To email, remove 'me' from my email address N6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "John Stio" <jstio@optonline.net> wrote in message news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > My local mechanic told me that this is a common problem in the Jeep 4.0. > That he has seen it and repaired it many times. > > After having the head replaced, and obviousely the head gasket, it had been > fine, coolant level stayed normal. > > There are no signs of coolant in the oil, or leaking externally. The other > odd thing is, it does not blow excessive smoke. On a pressure test, the > cooling system will hold pressure just fine. > > According to my Mechanic, the crack in the head causes the coolant to leak > into the cylinder after the vehicle is turned off. Basically i lose about an > Overflows worth of coolant over a month or so. > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, i > should not be going on my third head. > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > Any mayo in the oil, John ? > > > > Dave Milne, Scotland > > > > "John Stio" <jstio@optonline.net> wrote in message > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > Thanks Guys, > > > > > > I will look into these things. > > > Just to answer your questions, I have seen no external leaks, all looks > > > clean. > > > > > > From the last time, it has never overheated. > > > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > If your first one failed from overheating you may also have warped the > > > > block, causing gasket failure on your second one,which is losing the > > > coolant > > > > and may have cracked/warped the cylinder head. (I'm assuming you know > > that > > > > the best way to crack a cylinder head is to pour cold water into the > hot > > > > engine when you notice that the coolant is low, but I thought I'd > > mention > > > it > > > > just for completeness :-)). > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > > > > wrote: > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. > > > after > > > > > >many visits to the dealer and local mechanics, it turns out the > head > > > was > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > coolant > > > > level > > > > > >dropping yet again. > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > easily???? > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
Ditto... I'd be a little wary of a mechanic that calls a cracked head
(or even a blown head gasket) on the 4.0L a 'common problem'. Can't recall it ever being discussed on this newsgroup, and certainly none of my 10+ friends/aquaintances here locally with 4.0L TJ's (or even 4.0L YJ's) have ever experienced it. Dave http://mysite.verizon.net/res0p2es/david/index.htm On Sat, 24 Jan 2004 13:14:19 -0800, "Jerry Bransford" <jerrypb@mecox.net> wrote: >I'll just chime in with the others and agree that cracked heads are >definitely not common on the 4.0L engine. I've actually not even heard of >that happening myself though that's certainly not to say it can't or doesn't >happen. > >Jerry |
Re: 4.0 Cracked Head??
Ditto... I'd be a little wary of a mechanic that calls a cracked head
(or even a blown head gasket) on the 4.0L a 'common problem'. Can't recall it ever being discussed on this newsgroup, and certainly none of my 10+ friends/aquaintances here locally with 4.0L TJ's (or even 4.0L YJ's) have ever experienced it. Dave http://mysite.verizon.net/res0p2es/david/index.htm On Sat, 24 Jan 2004 13:14:19 -0800, "Jerry Bransford" <jerrypb@mecox.net> wrote: >I'll just chime in with the others and agree that cracked heads are >definitely not common on the 4.0L engine. I've actually not even heard of >that happening myself though that's certainly not to say it can't or doesn't >happen. > >Jerry |
Re: 4.0 Cracked Head??
Ditto... I'd be a little wary of a mechanic that calls a cracked head
(or even a blown head gasket) on the 4.0L a 'common problem'. Can't recall it ever being discussed on this newsgroup, and certainly none of my 10+ friends/aquaintances here locally with 4.0L TJ's (or even 4.0L YJ's) have ever experienced it. Dave http://mysite.verizon.net/res0p2es/david/index.htm On Sat, 24 Jan 2004 13:14:19 -0800, "Jerry Bransford" <jerrypb@mecox.net> wrote: >I'll just chime in with the others and agree that cracked heads are >definitely not common on the 4.0L engine. I've actually not even heard of >that happening myself though that's certainly not to say it can't or doesn't >happen. > >Jerry |
Re: 4.0 Cracked Head??
Is there a chance the deck of the block is not true? If the block is
warped it might be causing it to happen. I have 2 4.0L jeeps...and neither head has cracked (knock on wood). Sean "Jerry Bransford" <jerrypb@mecox.net> wrote in message news:MeBQb.11455$bg1.10563@fed1read05... > I'll just chime in with the others and agree that cracked heads are > definitely not common on the 4.0L engine. I've actually not even heard of > that happening myself though that's certainly not to say it can't or doesn't > happen. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > N6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "John Stio" <jstio@optonline.net> wrote in message > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > > My local mechanic told me that this is a common problem in the Jeep 4.0. > > That he has seen it and repaired it many times. > > > > After having the head replaced, and obviousely the head gasket, it had > been > > fine, coolant level stayed normal. > > > > There are no signs of coolant in the oil, or leaking externally. The other > > odd thing is, it does not blow excessive smoke. On a pressure test, the > > cooling system will hold pressure just fine. > > > > According to my Mechanic, the crack in the head causes the coolant to leak > > into the cylinder after the vehicle is turned off. Basically i lose about > an > > Overflows worth of coolant over a month or so. > > > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, > i > > should not be going on my third head. > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > > Any mayo in the oil, John ? > > > > > > Dave Milne, Scotland > > > > > > "John Stio" <jstio@optonline.net> wrote in message > > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > > Thanks Guys, > > > > > > > > I will look into these things. > > > > Just to answer your questions, I have seen no external leaks, all > looks > > > > clean. > > > > > > > > From the last time, it has never overheated. > > > > > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > > If your first one failed from overheating you may also have warped > the > > > > > block, causing gasket failure on your second one,which is losing the > > > > coolant > > > > > and may have cracked/warped the cylinder head. (I'm assuming you > know > > > that > > > > > the best way to crack a cylinder head is to pour cold water into the > > hot > > > > > engine when you notice that the coolant is low, but I thought I'd > > > mention > > > > it > > > > > just for completeness :-)). > > > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" > <jstio@optonline.net> > > > > > > wrote: > > > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant > missing. > > > > after > > > > > > >many visits to the dealer and local mechanics, it turns out the > > head > > > > was > > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > > coolant > > > > > level > > > > > > >dropping yet again. > > > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > > easily???? > > > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
Is there a chance the deck of the block is not true? If the block is
warped it might be causing it to happen. I have 2 4.0L jeeps...and neither head has cracked (knock on wood). Sean "Jerry Bransford" <jerrypb@mecox.net> wrote in message news:MeBQb.11455$bg1.10563@fed1read05... > I'll just chime in with the others and agree that cracked heads are > definitely not common on the 4.0L engine. I've actually not even heard of > that happening myself though that's certainly not to say it can't or doesn't > happen. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > N6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "John Stio" <jstio@optonline.net> wrote in message > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > > My local mechanic told me that this is a common problem in the Jeep 4.0. > > That he has seen it and repaired it many times. > > > > After having the head replaced, and obviousely the head gasket, it had > been > > fine, coolant level stayed normal. > > > > There are no signs of coolant in the oil, or leaking externally. The other > > odd thing is, it does not blow excessive smoke. On a pressure test, the > > cooling system will hold pressure just fine. > > > > According to my Mechanic, the crack in the head causes the coolant to leak > > into the cylinder after the vehicle is turned off. Basically i lose about > an > > Overflows worth of coolant over a month or so. > > > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, > i > > should not be going on my third head. > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > > Any mayo in the oil, John ? > > > > > > Dave Milne, Scotland > > > > > > "John Stio" <jstio@optonline.net> wrote in message > > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > > Thanks Guys, > > > > > > > > I will look into these things. > > > > Just to answer your questions, I have seen no external leaks, all > looks > > > > clean. > > > > > > > > From the last time, it has never overheated. > > > > > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > > If your first one failed from overheating you may also have warped > the > > > > > block, causing gasket failure on your second one,which is losing the > > > > coolant > > > > > and may have cracked/warped the cylinder head. (I'm assuming you > know > > > that > > > > > the best way to crack a cylinder head is to pour cold water into the > > hot > > > > > engine when you notice that the coolant is low, but I thought I'd > > > mention > > > > it > > > > > just for completeness :-)). > > > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" > <jstio@optonline.net> > > > > > > wrote: > > > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant > missing. > > > > after > > > > > > >many visits to the dealer and local mechanics, it turns out the > > head > > > > was > > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > > coolant > > > > > level > > > > > > >dropping yet again. > > > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > > easily???? > > > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
Is there a chance the deck of the block is not true? If the block is
warped it might be causing it to happen. I have 2 4.0L jeeps...and neither head has cracked (knock on wood). Sean "Jerry Bransford" <jerrypb@mecox.net> wrote in message news:MeBQb.11455$bg1.10563@fed1read05... > I'll just chime in with the others and agree that cracked heads are > definitely not common on the 4.0L engine. I've actually not even heard of > that happening myself though that's certainly not to say it can't or doesn't > happen. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > N6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "John Stio" <jstio@optonline.net> wrote in message > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > > My local mechanic told me that this is a common problem in the Jeep 4.0. > > That he has seen it and repaired it many times. > > > > After having the head replaced, and obviousely the head gasket, it had > been > > fine, coolant level stayed normal. > > > > There are no signs of coolant in the oil, or leaking externally. The other > > odd thing is, it does not blow excessive smoke. On a pressure test, the > > cooling system will hold pressure just fine. > > > > According to my Mechanic, the crack in the head causes the coolant to leak > > into the cylinder after the vehicle is turned off. Basically i lose about > an > > Overflows worth of coolant over a month or so. > > > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 miles, > i > > should not be going on my third head. > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > > Any mayo in the oil, John ? > > > > > > Dave Milne, Scotland > > > > > > "John Stio" <jstio@optonline.net> wrote in message > > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > > Thanks Guys, > > > > > > > > I will look into these things. > > > > Just to answer your questions, I have seen no external leaks, all > looks > > > > clean. > > > > > > > > From the last time, it has never overheated. > > > > > > > > THanks for all ur input. Hopefully it turns out to be something minor. > > > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > > If your first one failed from overheating you may also have warped > the > > > > > block, causing gasket failure on your second one,which is losing the > > > > coolant > > > > > and may have cracked/warped the cylinder head. (I'm assuming you > know > > > that > > > > > the best way to crack a cylinder head is to pour cold water into the > > hot > > > > > engine when you notice that the coolant is low, but I thought I'd > > > mention > > > > it > > > > > just for completeness :-)). > > > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" > <jstio@optonline.net> > > > > > > wrote: > > > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant > missing. > > > > after > > > > > > >many visits to the dealer and local mechanics, it turns out the > > head > > > > was > > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > > coolant > > > > > level > > > > > > >dropping yet again. > > > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > > easily???? > > > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
Thanks all for the input.
I'll post once i see what's up with it. "Sean Prinz" <s_prinz@msn.com> wrote in message news:buunkv$mbnsu$1@ID-137890.news.uni-berlin.de... > Is there a chance the deck of the block is not true? If the block is > warped it might be causing it to happen. I have 2 4.0L jeeps...and neither > head has cracked (knock on wood). > > Sean > > > "Jerry Bransford" <jerrypb@mecox.net> wrote in message > news:MeBQb.11455$bg1.10563@fed1read05... > > I'll just chime in with the others and agree that cracked heads are > > definitely not common on the 4.0L engine. I've actually not even heard of > > that happening myself though that's certainly not to say it can't or > doesn't > > happen. > > > > Jerry > > -- > > Jerry Bransford > > To email, remove 'me' from my email address > > N6TAY, PP-ASEL > > See the Geezer Jeep at > > http://members.cox.net/jerrypb/ > > > > "John Stio" <jstio@optonline.net> wrote in message > > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > > > My local mechanic told me that this is a common problem in the Jeep 4.0. > > > That he has seen it and repaired it many times. > > > > > > After having the head replaced, and obviousely the head gasket, it had > > been > > > fine, coolant level stayed normal. > > > > > > There are no signs of coolant in the oil, or leaking externally. The > other > > > odd thing is, it does not blow excessive smoke. On a pressure test, the > > > cooling system will hold pressure just fine. > > > > > > According to my Mechanic, the crack in the head causes the coolant to > leak > > > into the cylinder after the vehicle is turned off. Basically i lose > about > > an > > > Overflows worth of coolant over a month or so. > > > > > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 > miles, > > i > > > should not be going on my third head. > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > > > Any mayo in the oil, John ? > > > > > > > > Dave Milne, Scotland > > > > > > > > "John Stio" <jstio@optonline.net> wrote in message > > > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > > > Thanks Guys, > > > > > > > > > > I will look into these things. > > > > > Just to answer your questions, I have seen no external leaks, all > > looks > > > > > clean. > > > > > > > > > > From the last time, it has never overheated. > > > > > > > > > > THanks for all ur input. Hopefully it turns out to be something > minor. > > > > > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > > > If your first one failed from overheating you may also have warped > > the > > > > > > block, causing gasket failure on your second one,which is losing > the > > > > > coolant > > > > > > and may have cracked/warped the cylinder head. (I'm assuming you > > know > > > > that > > > > > > the best way to crack a cylinder head is to pour cold water into > the > > > hot > > > > > > engine when you notice that the coolant is low, but I thought I'd > > > > mention > > > > > it > > > > > > just for completeness :-)). > > > > > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" > > <jstio@optonline.net> > > > > > > > wrote: > > > > > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant > > missing. > > > > > after > > > > > > > >many visits to the dealer and local mechanics, it turns out the > > > head > > > > > was > > > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > > > coolant > > > > > > level > > > > > > > >dropping yet again. > > > > > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > > > easily???? > > > > > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
Thanks all for the input.
I'll post once i see what's up with it. "Sean Prinz" <s_prinz@msn.com> wrote in message news:buunkv$mbnsu$1@ID-137890.news.uni-berlin.de... > Is there a chance the deck of the block is not true? If the block is > warped it might be causing it to happen. I have 2 4.0L jeeps...and neither > head has cracked (knock on wood). > > Sean > > > "Jerry Bransford" <jerrypb@mecox.net> wrote in message > news:MeBQb.11455$bg1.10563@fed1read05... > > I'll just chime in with the others and agree that cracked heads are > > definitely not common on the 4.0L engine. I've actually not even heard of > > that happening myself though that's certainly not to say it can't or > doesn't > > happen. > > > > Jerry > > -- > > Jerry Bransford > > To email, remove 'me' from my email address > > N6TAY, PP-ASEL > > See the Geezer Jeep at > > http://members.cox.net/jerrypb/ > > > > "John Stio" <jstio@optonline.net> wrote in message > > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > > > My local mechanic told me that this is a common problem in the Jeep 4.0. > > > That he has seen it and repaired it many times. > > > > > > After having the head replaced, and obviousely the head gasket, it had > > been > > > fine, coolant level stayed normal. > > > > > > There are no signs of coolant in the oil, or leaking externally. The > other > > > odd thing is, it does not blow excessive smoke. On a pressure test, the > > > cooling system will hold pressure just fine. > > > > > > According to my Mechanic, the crack in the head causes the coolant to > leak > > > into the cylinder after the vehicle is turned off. Basically i lose > about > > an > > > Overflows worth of coolant over a month or so. > > > > > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 > miles, > > i > > > should not be going on my third head. > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > > > Any mayo in the oil, John ? > > > > > > > > Dave Milne, Scotland > > > > > > > > "John Stio" <jstio@optonline.net> wrote in message > > > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > > > Thanks Guys, > > > > > > > > > > I will look into these things. > > > > > Just to answer your questions, I have seen no external leaks, all > > looks > > > > > clean. > > > > > > > > > > From the last time, it has never overheated. > > > > > > > > > > THanks for all ur input. Hopefully it turns out to be something > minor. > > > > > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > > > If your first one failed from overheating you may also have warped > > the > > > > > > block, causing gasket failure on your second one,which is losing > the > > > > > coolant > > > > > > and may have cracked/warped the cylinder head. (I'm assuming you > > know > > > > that > > > > > > the best way to crack a cylinder head is to pour cold water into > the > > > hot > > > > > > engine when you notice that the coolant is low, but I thought I'd > > > > mention > > > > > it > > > > > > just for completeness :-)). > > > > > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" > > <jstio@optonline.net> > > > > > > > wrote: > > > > > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant > > missing. > > > > > after > > > > > > > >many visits to the dealer and local mechanics, it turns out the > > > head > > > > > was > > > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > > > coolant > > > > > > level > > > > > > > >dropping yet again. > > > > > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > > > easily???? > > > > > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
Thanks all for the input.
I'll post once i see what's up with it. "Sean Prinz" <s_prinz@msn.com> wrote in message news:buunkv$mbnsu$1@ID-137890.news.uni-berlin.de... > Is there a chance the deck of the block is not true? If the block is > warped it might be causing it to happen. I have 2 4.0L jeeps...and neither > head has cracked (knock on wood). > > Sean > > > "Jerry Bransford" <jerrypb@mecox.net> wrote in message > news:MeBQb.11455$bg1.10563@fed1read05... > > I'll just chime in with the others and agree that cracked heads are > > definitely not common on the 4.0L engine. I've actually not even heard of > > that happening myself though that's certainly not to say it can't or > doesn't > > happen. > > > > Jerry > > -- > > Jerry Bransford > > To email, remove 'me' from my email address > > N6TAY, PP-ASEL > > See the Geezer Jeep at > > http://members.cox.net/jerrypb/ > > > > "John Stio" <jstio@optonline.net> wrote in message > > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > > > My local mechanic told me that this is a common problem in the Jeep 4.0. > > > That he has seen it and repaired it many times. > > > > > > After having the head replaced, and obviousely the head gasket, it had > > been > > > fine, coolant level stayed normal. > > > > > > There are no signs of coolant in the oil, or leaking externally. The > other > > > odd thing is, it does not blow excessive smoke. On a pressure test, the > > > cooling system will hold pressure just fine. > > > > > > According to my Mechanic, the crack in the head causes the coolant to > leak > > > into the cylinder after the vehicle is turned off. Basically i lose > about > > an > > > Overflows worth of coolant over a month or so. > > > > > > I love my jeep, but i am getting fed up. in 2 1/2 years and 40,000 > miles, > > i > > > should not be going on my third head. > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > news:WJAQb.8689$0c1.94998774@news-text.cableinet.net... > > > > Any mayo in the oil, John ? > > > > > > > > Dave Milne, Scotland > > > > > > > > "John Stio" <jstio@optonline.net> wrote in message > > > > news:zBAQb.14055$O22.8725076@news4.srv.hcvlny.cv.n et... > > > > > Thanks Guys, > > > > > > > > > > I will look into these things. > > > > > Just to answer your questions, I have seen no external leaks, all > > looks > > > > > clean. > > > > > > > > > > From the last time, it has never overheated. > > > > > > > > > > THanks for all ur input. Hopefully it turns out to be something > minor. > > > > > > > > > > "Dave Milne" <jeep@_nospam_milne.info> wrote in message > > > > > news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > > > > > > If your first one failed from overheating you may also have warped > > the > > > > > > block, causing gasket failure on your second one,which is losing > the > > > > > coolant > > > > > > and may have cracked/warped the cylinder head. (I'm assuming you > > know > > > > that > > > > > > the best way to crack a cylinder head is to pour cold water into > the > > > hot > > > > > > engine when you notice that the coolant is low, but I thought I'd > > > > mention > > > > > it > > > > > > just for completeness :-)). > > > > > > > > > > > > Dave Milne, Scotland > > > > > > > > > > > > > > > > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > > > > > > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > > > > > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" > > <jstio@optonline.net> > > > > > > > wrote: > > > > > > > > > > > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant > > missing. > > > > > after > > > > > > > >many visits to the dealer and local mechanics, it turns out the > > > head > > > > > was > > > > > > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > > > > > > > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the > > > > coolant > > > > > > level > > > > > > > >dropping yet again. > > > > > > > > > > > > > > > >Does anyone know what the flaw is, and why these heads crack so > > > > > > easily???? > > > > > > > > > > > > > > Never heard of it. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: 4.0 Cracked Head??
Ditto what Jerry said. I've been reading this group (though i rarely
post) and driving Jeeps with 4.0s since 1998. Cracked heads appear to be very, very rare. Your mechanic may have been just shooting the breeze. Regards, DAve Jerry Bransford wrote: > I'll just chime in with the others and agree that cracked heads are > definitely not common on the 4.0L engine. I've actually not even heard of > that happening myself though that's certainly not to say it can't or doesn't > happen. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > N6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "John Stio" <jstio@optonline.net> wrote in message > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > >>My local mechanic told me that this is a common problem in the Jeep 4.0. >>That he has seen it and repaired it many times. > |
Re: 4.0 Cracked Head??
Ditto what Jerry said. I've been reading this group (though i rarely
post) and driving Jeeps with 4.0s since 1998. Cracked heads appear to be very, very rare. Your mechanic may have been just shooting the breeze. Regards, DAve Jerry Bransford wrote: > I'll just chime in with the others and agree that cracked heads are > definitely not common on the 4.0L engine. I've actually not even heard of > that happening myself though that's certainly not to say it can't or doesn't > happen. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > N6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "John Stio" <jstio@optonline.net> wrote in message > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > >>My local mechanic told me that this is a common problem in the Jeep 4.0. >>That he has seen it and repaired it many times. > |
Re: 4.0 Cracked Head??
Ditto what Jerry said. I've been reading this group (though i rarely
post) and driving Jeeps with 4.0s since 1998. Cracked heads appear to be very, very rare. Your mechanic may have been just shooting the breeze. Regards, DAve Jerry Bransford wrote: > I'll just chime in with the others and agree that cracked heads are > definitely not common on the 4.0L engine. I've actually not even heard of > that happening myself though that's certainly not to say it can't or doesn't > happen. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > N6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "John Stio" <jstio@optonline.net> wrote in message > news:zaBQb.14736$O22.8912037@news4.srv.hcvlny.cv.n et... > >>My local mechanic told me that this is a common problem in the Jeep 4.0. >>That he has seen it and repaired it many times. > |
Re: 4.0 Cracked Head??
Never heard of a warped block in my 30 some years in and out of the
business. They true up block decks to take up minor irregularities and to achieve a higher degree of squareness than the factory did. I suspect he has a different leak somewhere else and that his mechanic doesn/t know jack. Cracked heads on 4.0's is definately not a common problem. I did notice one thing when putting a 4.o back together once that may be a clue. All of the head bolts call for 110 lbs on the torque wrench except for the left front which is 100. Could be a weakness in the gasket at this point and prone to leaking at that corner. Steve "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > If your first one failed from overheating you may also have warped the > block, causing gasket failure on your second one,which is losing the coolant > and may have cracked/warped the cylinder head. (I'm assuming you know that > the best way to crack a cylinder head is to pour cold water into the hot > engine when you notice that the coolant is low, but I thought I'd mention it > just for completeness :-)). > > Dave Milne, Scotland > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > wrote: > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > > >many visits to the dealer and local mechanics, it turns out the head was > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > level > > >dropping yet again. > > > > > >Does anyone know what the flaw is, and why these heads crack so > easily???? > > > > Never heard of it. > > |
Re: 4.0 Cracked Head??
Never heard of a warped block in my 30 some years in and out of the
business. They true up block decks to take up minor irregularities and to achieve a higher degree of squareness than the factory did. I suspect he has a different leak somewhere else and that his mechanic doesn/t know jack. Cracked heads on 4.0's is definately not a common problem. I did notice one thing when putting a 4.o back together once that may be a clue. All of the head bolts call for 110 lbs on the torque wrench except for the left front which is 100. Could be a weakness in the gasket at this point and prone to leaking at that corner. Steve "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > If your first one failed from overheating you may also have warped the > block, causing gasket failure on your second one,which is losing the coolant > and may have cracked/warped the cylinder head. (I'm assuming you know that > the best way to crack a cylinder head is to pour cold water into the hot > engine when you notice that the coolant is low, but I thought I'd mention it > just for completeness :-)). > > Dave Milne, Scotland > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > wrote: > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > > >many visits to the dealer and local mechanics, it turns out the head was > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > level > > >dropping yet again. > > > > > >Does anyone know what the flaw is, and why these heads crack so > easily???? > > > > Never heard of it. > > |
Re: 4.0 Cracked Head??
Never heard of a warped block in my 30 some years in and out of the
business. They true up block decks to take up minor irregularities and to achieve a higher degree of squareness than the factory did. I suspect he has a different leak somewhere else and that his mechanic doesn/t know jack. Cracked heads on 4.0's is definately not a common problem. I did notice one thing when putting a 4.o back together once that may be a clue. All of the head bolts call for 110 lbs on the torque wrench except for the left front which is 100. Could be a weakness in the gasket at this point and prone to leaking at that corner. Steve "Dave Milne" <jeep@_nospam_milne.info> wrote in message news:TQzQb.8654$oM.94638298@news-text.cableinet.net... > If your first one failed from overheating you may also have warped the > block, causing gasket failure on your second one,which is losing the coolant > and may have cracked/warped the cylinder head. (I'm assuming you know that > the best way to crack a cylinder head is to pour cold water into the hot > engine when you notice that the coolant is low, but I thought I'd mention it > just for completeness :-)). > > Dave Milne, Scotland > > > "Matt Osborn" <msosborn@spam_trap@attglobal.net> wrote in message > news:q5e510l9111jfrbtnq59v1ho3rui9dr8oe@4ax.com... > > On Sat, 24 Jan 2004 15:28:16 GMT, "John Stio" <jstio@optonline.net> > > wrote: > > > > >I have an 02 TJ, at around 24,000 miles i noticed coolant missing. after > > >many visits to the dealer and local mechanics, it turns out the head was > > >cracked. The head was replaced at 30,000 miles this past July. > > > > > >The jeep now has 40,000 miles and two weeks ago, i noticed the coolant > level > > >dropping yet again. > > > > > >Does anyone know what the flaw is, and why these heads crack so > easily???? > > > > Never heard of it. > > |
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