Oil Leaks - JeepForum.com
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post #1 of 4 Old 04-13-2004, 07:40 PM Thread Starter
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Oil Leaks

I go through oil like it poop through a moose. My engine doesn't seem to be bruning it off, but it does seem to be leaking all over the place. Where's the most common place for a 258 (4.2L) to leak oil?

If I had the funds, I'd pull the engine and replace all the seals (they're all original after 133000 miles). Course if I had the funds I'd replace the engine with a 350...

But it looks like I need to go after the major seals one by one, starting with the most problematic. Any ideas?

89 YJ 4.2 auto


Mazdaboy is offline  
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post #2 of 4 Old 04-13-2004, 08:19 PM
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Ok here are the three top seals to replace

Rear Main seal. Probably one of the hardest to replace. Plan for at least 4 hrs.
This will lead you in to the next which is the oil pan. Get a good one piece seal to replace the old style three piece. I got mine from napa.
The last would be the valve cover seal. This is fairly easy to do once you have all the crap removed from the top of it.
Hope this helps.
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post #3 of 4 Old 04-14-2004, 11:38 AM
Join Date: Jan 2004
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First check your PCV valve, the hoses and the grommet that holds the PCV valave into the valve cover. My 90 had some leaks until I changed the grommets. They get hard and don't hold the vacuum like they should.
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post #4 of 4 Old 04-14-2004, 02:41 PM
Join Date: Jun 2003
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mine was leaking from the valve cover I replaced the gasket I t did leak quite a bit
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