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4L Oil Leaks on my XJ
Hello All
I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. Thanks Mike |
Re: 4L Oil Leaks on my XJ
On Fri, 19 Dec 2003 23:32:22 UTC "Mikes_XJ" <mdufour@iwon.com> wrote:
> Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. Before you get into expensive fixes (it could be a head gasket) check the CCV system. If the crankcase isn't breathing right, you will force oil out every seal at high RPM as pressure builds in the crankcase. BTDT. If it's speed sensitive, that's the first place I would look. It may well be as simple as removing the valve cover to clean the breather and CCV ports. Pull the CCV line (rear of valve cover) and make sure it's clear. Dont forget the port where it plugs into the intake manifold. Check the breather tube to the airbox (mine got plugged when it collapsed and shut off flow, but the 88 had a 180 degree bend that was prone to such nonsense). Once you have eliminated the simple things you can start to think head gasket. Oh, and I had a timing cover bolt work loose near the top and it did the same thing but blew the oil back along the head just like a gasket leak. After a long road trip it would sit there and just drip. -- Will Honea <whonea@codenet.net> |
Re: 4L Oil Leaks on my XJ
On Fri, 19 Dec 2003 23:32:22 UTC "Mikes_XJ" <mdufour@iwon.com> wrote:
> Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. Before you get into expensive fixes (it could be a head gasket) check the CCV system. If the crankcase isn't breathing right, you will force oil out every seal at high RPM as pressure builds in the crankcase. BTDT. If it's speed sensitive, that's the first place I would look. It may well be as simple as removing the valve cover to clean the breather and CCV ports. Pull the CCV line (rear of valve cover) and make sure it's clear. Dont forget the port where it plugs into the intake manifold. Check the breather tube to the airbox (mine got plugged when it collapsed and shut off flow, but the 88 had a 180 degree bend that was prone to such nonsense). Once you have eliminated the simple things you can start to think head gasket. Oh, and I had a timing cover bolt work loose near the top and it did the same thing but blew the oil back along the head just like a gasket leak. After a long road trip it would sit there and just drip. -- Will Honea <whonea@codenet.net> |
Re: 4L Oil Leaks on my XJ
On Fri, 19 Dec 2003 23:32:22 UTC "Mikes_XJ" <mdufour@iwon.com> wrote:
> Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. Before you get into expensive fixes (it could be a head gasket) check the CCV system. If the crankcase isn't breathing right, you will force oil out every seal at high RPM as pressure builds in the crankcase. BTDT. If it's speed sensitive, that's the first place I would look. It may well be as simple as removing the valve cover to clean the breather and CCV ports. Pull the CCV line (rear of valve cover) and make sure it's clear. Dont forget the port where it plugs into the intake manifold. Check the breather tube to the airbox (mine got plugged when it collapsed and shut off flow, but the 88 had a 180 degree bend that was prone to such nonsense). Once you have eliminated the simple things you can start to think head gasket. Oh, and I had a timing cover bolt work loose near the top and it did the same thing but blew the oil back along the head just like a gasket leak. After a long road trip it would sit there and just drip. -- Will Honea <whonea@codenet.net> |
Re: 4L Oil Leaks on my XJ
Hi Mike,
More than likely the orafice is clogged where it enters the intake manifold, cause normal blowby to force oil out everywhere. I'd convert it over to a Positive Crankcase Ventilation by drilling our the orafice and adding the valve as pictured at: http://home.sprynet.com/~dale02/vac-pcv.htm God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ Mikes_XJ wrote: > > Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. > Thanks > Mike |
Re: 4L Oil Leaks on my XJ
Hi Mike,
More than likely the orafice is clogged where it enters the intake manifold, cause normal blowby to force oil out everywhere. I'd convert it over to a Positive Crankcase Ventilation by drilling our the orafice and adding the valve as pictured at: http://home.sprynet.com/~dale02/vac-pcv.htm God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ Mikes_XJ wrote: > > Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. > Thanks > Mike |
Re: 4L Oil Leaks on my XJ
Hi Mike,
More than likely the orafice is clogged where it enters the intake manifold, cause normal blowby to force oil out everywhere. I'd convert it over to a Positive Crankcase Ventilation by drilling our the orafice and adding the valve as pictured at: http://home.sprynet.com/~dale02/vac-pcv.htm God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ Mikes_XJ wrote: > > Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. > Thanks > Mike |
Re: 4L Oil Leaks on my XJ
It shouldn't be the head gasket, because since it does not have an overhead
camshaft, it really doesn't have high oil pressure going through the gasket. The oil reaches the upper head area through the pushrods and then drains back through the head's drain holes. Where is this oil, front or rear or passenger side? Common leaks are from the oil filter housing or the oil pressure sending unit. Of course I could be mistaken. :-) -- later, dave 88 XJ 4.0 auto 82 Wag Ltd. 360 auto (to be retired!) anyone interested, whole or parts? 88 FSJ-GW 360 auto (GRAND 88) Chicago "Mikes_XJ" <mdufour@iwon.com> wrote in message news:fb6c71924ae3e8a87e560d440985bfa4@localhost.ta lkaboutautos.com... > Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. > Thanks > Mike > > |
Re: 4L Oil Leaks on my XJ
It shouldn't be the head gasket, because since it does not have an overhead
camshaft, it really doesn't have high oil pressure going through the gasket. The oil reaches the upper head area through the pushrods and then drains back through the head's drain holes. Where is this oil, front or rear or passenger side? Common leaks are from the oil filter housing or the oil pressure sending unit. Of course I could be mistaken. :-) -- later, dave 88 XJ 4.0 auto 82 Wag Ltd. 360 auto (to be retired!) anyone interested, whole or parts? 88 FSJ-GW 360 auto (GRAND 88) Chicago "Mikes_XJ" <mdufour@iwon.com> wrote in message news:fb6c71924ae3e8a87e560d440985bfa4@localhost.ta lkaboutautos.com... > Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. > Thanks > Mike > > |
Re: 4L Oil Leaks on my XJ
It shouldn't be the head gasket, because since it does not have an overhead
camshaft, it really doesn't have high oil pressure going through the gasket. The oil reaches the upper head area through the pushrods and then drains back through the head's drain holes. Where is this oil, front or rear or passenger side? Common leaks are from the oil filter housing or the oil pressure sending unit. Of course I could be mistaken. :-) -- later, dave 88 XJ 4.0 auto 82 Wag Ltd. 360 auto (to be retired!) anyone interested, whole or parts? 88 FSJ-GW 360 auto (GRAND 88) Chicago "Mikes_XJ" <mdufour@iwon.com> wrote in message news:fb6c71924ae3e8a87e560d440985bfa4@localhost.ta lkaboutautos.com... > Hello All > I have a 90 XJ and it has developed a speed sensitive oil leak. When I drive below 40 mph it seems to be minimal. If I drive on the HW over 70 mph it leaks like a siv. I washed down the engine and then drove it around for a couple miles. When I poped the hood it looks like the oil is comming from the head gasket, not the valve cover. Is this tipical on this engine? > Ive seen in other postings that other people have had problems with the oil gasket ont the filter housing, and im sure it not comming from there. > Thanks > Mike > > |
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