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post #1 of 9 Old 05-02-2001, 01:04 AM Thread Starter
ncmts
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Another oil leak question

1990 YJ, 6 cyl..just bought today. I understand the pressure can build in the crankcase and blow back through the PVC and air cleaner. But I also read an article about the plastic valve cover leaking alot. I would like to know what anybody's experience is with this. Which one sounds like it may be the culprit? As usual, there is oil all over the valve cover and hard to tell where the leak is.. Also the aluminum valve covers tell you it will be necessary to tap a new hole in the cyl. head. NOT too crazy about that.. Should I buy a new plastic vavle cover? Thanks for your help.. Newbie to the board...

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post #2 of 9 Old 05-02-2001, 01:37 PM
Keith
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Just went through this. Take off the valve cover and see if it is cracked, mine was. If it is then buy a new one (www.4wd.com) if not then just replace the gasket as well as the PVC valve. Mine was also leaking from the cap on top of the valve cover, I used some gasket sealer and that solved that problem.

A/S/L me
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post #3 of 9 Old 05-02-2001, 10:32 PM
Razskidoo
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I heard that the valve cover gasket is preform, is that true?
I have the same problem! leaks @ back of valve cover and all over the bottom of the jeep, (also in the air cleaner. Whats the cure for this?) I tried to get a pvc for my 92" and they told me it's not needed or It does'nt call for one. If I have one there should be a replacement! RIGHT

92 Wangler ,I-6 ,3"lift, 32x12.5
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post #4 of 9 Old 05-02-2001, 11:37 PM
bigjeep39
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Hey same problem with mine, replace the valve cover gasket, the plastic lid, (silicone) and it also leaked from the dipstick, push it on all the way, there is usually pressure under that while driving.

1998 TJ
Slow steady project.
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post #5 of 9 Old 05-03-2001, 06:40 AM
jeeptuff
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I believe it was 92 and later there is no PCV, they are classified as a CCV(crank case ventilator). No part stores carry them that i have found. It is a dealer item only..

Eric
Once again Jeepless in Seattle
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post #6 of 9 Old 05-03-2001, 12:13 PM
Loomis4wheeler
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Your 92' should not have a plastic cover, they stopped installing them in 86', although some 87's came with them (like mine). If for some strange reason you have a plastic cover, I recommend replacing it(you'll fight this thing forever). The best replacement cover on the market is one made by Westside. It's a clean bolt in (no tapping required, however, it is somewhat costly at $160. With this cover, no gasket is used, only RTV. The job can be completed in a few hours. Note: make sure you clean the mating surfaces on the head to ensure leak free fit.
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post #7 of 9 Old 05-04-2001, 09:52 AM Thread Starter
ncmts
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Razskidoo..... look at this site for a good article on oil in the air cleaner
http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

also this one might help too
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post #8 of 9 Old 05-04-2001, 09:52 AM Thread Starter
ncmts
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Razskidoo..... look at this site for a good article on oil in the air cleaner
http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

also this one might help too http://www.off-road.com/jeep/cheroke...ver/cover.html
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post #9 of 9 Old 05-05-2001, 11:44 AM
Razskidoo
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Thanks, ncmts

92 Wangler ,I-6 ,3"lift, 32x12.5
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