88 4.2 leak from the rear main seal - Jeep Wrangler Forum
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Old 08-22-2013, 06:38 PM   #1
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88 4.2 leak from the rear main seal

thinking i have a leak from my rear main. oil is dripping down on hitting the exhaust and causing some gnarly fumes. its almost undriveable with the top buttoned up.

OR it from the back of the valve cover... not sure

i don't have the skills/tools to tear the trans from the block to replace. anyone have this done and know how long it takes? trying to estimate a price in my head

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Old 08-22-2013, 06:41 PM   #2
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or i need to try and build a drip plate, but it doesn't solve the problem of oil leaking all over everyone's driveway

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Old 08-22-2013, 07:41 PM   #3
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I did mine. Pretty simple, just have to take your time. The trans can stay attached. It's a 2 piece seal. Just gotta get the oil pan off, and then the last bearing cap off at the rear of the block. The other part if the seal is still in the block on and will probably need pushed out with a pick. Then should be able to pull out the when its sticky out far enough. Installation is the same but I the seal that goes into the block had to face a specific way. I forget his it goes but just live it up and be careful not to rip it. Otherwise you will have it all buttoned up and the seal will leak again. If you have the cash you should replace the oil pump too just to make sure that's all good. I didn't and now a year later I gotta change it now.

http://jeepin.com/features/rearmain

This is for a 4.0 but its the same. Hope this helps!
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Old 08-22-2013, 09:03 PM   #4
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man - looks really doable except the upper part that goes into the block. i can really see myself F'ing that up....

but to save $450 bucks? HMMMMMM
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Old 08-23-2013, 08:08 AM   #5
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It's really not bad, I was nervousness when I did it to but just take your time. It is well worth doing ur self. I'm still kicking myself for not doing the oil pump.
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Old 08-23-2013, 08:30 AM   #6
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you might try changing the valve cover gasket first..that might get the majority of it and save you from having to do the rear main
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Old 08-23-2013, 08:43 AM   #7
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I thought my rear main was leaking but when I pulled the oil pan to change it I found the rear main to be fine and it was just the back part of the pan gasket. If you do it yourself do not skimp on a new pan gasket. I bought the felpro molded one piece gasket and I haven't had a drip since. Definitely worth the extra couple bucks. Do the oil pump while your in there, you won't regret it. There's also a metal strap that tightens the curved back part of the pan with two bolts. Mine was stretched so I fixed it by closing the little tabs on it with a punch in my vise. Might want to look into getting a new one if possible.

Here's the pan gasket I got: http://m.advanceautoparts.com/mt/sho...oil+pan+gasket
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Old 08-23-2013, 09:19 AM   #8
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Quote:
Originally Posted by harleydragon View Post
you might try changing the valve cover gasket first..that might get the majority of it and save you from having to do the rear main
check the torque specs, and make sure you torque in order or it's still gonna leak.
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Old 08-23-2013, 12:30 PM   #9
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i know the valve gasket is new - its the blue one piece molded... its was like $50!

maybe it didn't sit correctly? can the cover come off and be put back on with that gasket? or would i need to buy a new one? i guess if its shot i need a new one anyway
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Old 08-23-2013, 12:48 PM   #10
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Originally Posted by schwag27 View Post
i know the valve gasket is new - its the blue one piece molded... its was like $50!

maybe it didn't sit correctly? can the cover come off and be put back on with that gasket? or would i need to buy a new one? i guess if its shot i need a new one anyway
I did mine with the gasket and rtv, checked the torque specs, torqued in order then went back and checked them again. 2 years no leaky valve cover.
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Old 08-24-2013, 05:24 PM   #11
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anyone know where i can find how to torque down the valve cover?

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