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sparkplug blow by
Hi all,
I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under the hood checking vacuum problems that I have a small blow by ...its around a sparkplug... have tried pulling the plug and cleaning around it and everything..no dirt or anothing there. Any idea's on how to fix this... With the blowby I am losing compression in turn losing power... any help would be great! Thanks in advance!! Tracy |
Re: sparkplug blow by
Is it missing the sealing washer?
If not, I would try another plug. If it still leaks, well..... If the threads are stripped, you can retap them and put a sleeve in for an oversize hole, if it has a crack, it is likely a dead head. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Knight wrote: > > Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! > > Tracy |
Re: sparkplug blow by
Is it missing the sealing washer?
If not, I would try another plug. If it still leaks, well..... If the threads are stripped, you can retap them and put a sleeve in for an oversize hole, if it has a crack, it is likely a dead head. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Knight wrote: > > Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! > > Tracy |
Re: sparkplug blow by
Is it missing the sealing washer?
If not, I would try another plug. If it still leaks, well..... If the threads are stripped, you can retap them and put a sleeve in for an oversize hole, if it has a crack, it is likely a dead head. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Knight wrote: > > Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! > > Tracy |
Re: sparkplug blow by
Yeah it has the washer. I was thinking about retapping and doing the whole
sleeve thing because as far as I can tell there are no cracks. By the way I did get my signal lights fixed....if you remember. Now I just need to get the oil problem fixed...I think most of the oil is coming from the rubber gromets that hold the pvc valve and the valve cover breather in place. Anyways Thanks again Mike. I've been having all kinds of fun in the snow this year with the old jeep. Tracy "Mike Romain" <romainm@sympatico.ca> wrote in message news:41F1173C.F8123FEF@sympatico.ca... > Is it missing the sealing washer? > > If not, I would try another plug. If it still leaks, well..... > > If the threads are stripped, you can retap them and put a sleeve in for > an oversize hole, if it has a crack, it is likely a dead head. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > > Knight wrote: > > > > Hi all, > > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > > the hood checking vacuum problems that I have a small blow by ...its around > > a sparkplug... have tried pulling the plug and cleaning around it and > > everything..no dirt or anothing there. Any idea's on how to fix this... With > > the blowby I am losing compression in turn losing power... any help would be > > great! Thanks in advance!! > > > > Tracy |
Re: sparkplug blow by
Yeah it has the washer. I was thinking about retapping and doing the whole
sleeve thing because as far as I can tell there are no cracks. By the way I did get my signal lights fixed....if you remember. Now I just need to get the oil problem fixed...I think most of the oil is coming from the rubber gromets that hold the pvc valve and the valve cover breather in place. Anyways Thanks again Mike. I've been having all kinds of fun in the snow this year with the old jeep. Tracy "Mike Romain" <romainm@sympatico.ca> wrote in message news:41F1173C.F8123FEF@sympatico.ca... > Is it missing the sealing washer? > > If not, I would try another plug. If it still leaks, well..... > > If the threads are stripped, you can retap them and put a sleeve in for > an oversize hole, if it has a crack, it is likely a dead head. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > > Knight wrote: > > > > Hi all, > > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > > the hood checking vacuum problems that I have a small blow by ...its around > > a sparkplug... have tried pulling the plug and cleaning around it and > > everything..no dirt or anothing there. Any idea's on how to fix this... With > > the blowby I am losing compression in turn losing power... any help would be > > great! Thanks in advance!! > > > > Tracy |
Re: sparkplug blow by
Yeah it has the washer. I was thinking about retapping and doing the whole
sleeve thing because as far as I can tell there are no cracks. By the way I did get my signal lights fixed....if you remember. Now I just need to get the oil problem fixed...I think most of the oil is coming from the rubber gromets that hold the pvc valve and the valve cover breather in place. Anyways Thanks again Mike. I've been having all kinds of fun in the snow this year with the old jeep. Tracy "Mike Romain" <romainm@sympatico.ca> wrote in message news:41F1173C.F8123FEF@sympatico.ca... > Is it missing the sealing washer? > > If not, I would try another plug. If it still leaks, well..... > > If the threads are stripped, you can retap them and put a sleeve in for > an oversize hole, if it has a crack, it is likely a dead head. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > > Knight wrote: > > > > Hi all, > > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > > the hood checking vacuum problems that I have a small blow by ...its around > > a sparkplug... have tried pulling the plug and cleaning around it and > > everything..no dirt or anothing there. Any idea's on how to fix this... With > > the blowby I am losing compression in turn losing power... any help would be > > great! Thanks in advance!! > > > > Tracy |
Re: sparkplug blow by
look at the threads in the head.
if they are bad, you can rethread them and screw in a helicoil thread setup. , or change the heads. old john "Knight" <tknight@usacops.com> wrote in message news:10v256mbv93249c@corp.supernews.com... > Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! > > Tracy > > |
Re: sparkplug blow by
look at the threads in the head.
if they are bad, you can rethread them and screw in a helicoil thread setup. , or change the heads. old john "Knight" <tknight@usacops.com> wrote in message news:10v256mbv93249c@corp.supernews.com... > Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! > > Tracy > > |
Re: sparkplug blow by
look at the threads in the head.
if they are bad, you can rethread them and screw in a helicoil thread setup. , or change the heads. old john "Knight" <tknight@usacops.com> wrote in message news:10v256mbv93249c@corp.supernews.com... > Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! > > Tracy > > |
Re: sparkplug blow by
Knight did pass the time by typing:
> Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! swap plugs and see if the problem moves. If so it's the plug that's cracked, if not it's the threads. That's the number one reason why a torque wrench should be used on sparkplugs. I've seen several engines where a gorilla twisted the threads off. Save-a-thread works http://toolrage.com/prodView.asp?idproduct=1091 http://www.metricscrew-toolco.com/newpg1.html Remember to use oil on the tap and remove/clean it frequently. Any metal shavings in the cyl will be bad juju. -- DougW |
Re: sparkplug blow by
Knight did pass the time by typing:
> Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! swap plugs and see if the problem moves. If so it's the plug that's cracked, if not it's the threads. That's the number one reason why a torque wrench should be used on sparkplugs. I've seen several engines where a gorilla twisted the threads off. Save-a-thread works http://toolrage.com/prodView.asp?idproduct=1091 http://www.metricscrew-toolco.com/newpg1.html Remember to use oil on the tap and remove/clean it frequently. Any metal shavings in the cyl will be bad juju. -- DougW |
Re: sparkplug blow by
Knight did pass the time by typing:
> Hi all, > I have a 1986 Cherokee Pioneer with the dreaded 2.5L I noticed while under > the hood checking vacuum problems that I have a small blow by ...its around > a sparkplug... have tried pulling the plug and cleaning around it and > everything..no dirt or anothing there. Any idea's on how to fix this... With > the blowby I am losing compression in turn losing power... any help would be > great! Thanks in advance!! swap plugs and see if the problem moves. If so it's the plug that's cracked, if not it's the threads. That's the number one reason why a torque wrench should be used on sparkplugs. I've seen several engines where a gorilla twisted the threads off. Save-a-thread works http://toolrage.com/prodView.asp?idproduct=1091 http://www.metricscrew-toolco.com/newpg1.html Remember to use oil on the tap and remove/clean it frequently. Any metal shavings in the cyl will be bad juju. -- DougW |
Re: sparkplug blow by
> That's the number one reason why a torque wrench should be used on
> sparkplugs. > I've seen several engines where a gorilla twisted the threads off. It also controls the stretch on the plug, which changes the gap and heat. I didn't believe it until I tried plugs set by hand on an emissions machine, then by torque wrench. It made a measurable difference. -- Paul Calman, Hathaway Pines, California |
Re: sparkplug blow by
> That's the number one reason why a torque wrench should be used on
> sparkplugs. > I've seen several engines where a gorilla twisted the threads off. It also controls the stretch on the plug, which changes the gap and heat. I didn't believe it until I tried plugs set by hand on an emissions machine, then by torque wrench. It made a measurable difference. -- Paul Calman, Hathaway Pines, California |
Re: sparkplug blow by
> That's the number one reason why a torque wrench should be used on
> sparkplugs. > I've seen several engines where a gorilla twisted the threads off. It also controls the stretch on the plug, which changes the gap and heat. I didn't believe it until I tried plugs set by hand on an emissions machine, then by torque wrench. It made a measurable difference. -- Paul Calman, Hathaway Pines, California |
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