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Old 11-15-2009, 04:37 PM   #1
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Need help BAD!

Guys,
As short as I can be: '90 4.2L in a Wrangler. Two(2) new rear mains in one week. Still leaking. I did these two installs by the book, no chance install was wrong. Let me say that when I got this Jeep vacuum hoses cut and blocked off, emissions cut out etc. Now to today: as I said still dripping between tranny shield so with some looking around I see that a vacuum line runs from the carb (Carter) to a tee that runs to both valve cover hoses so suction is pulling from the valve cover, I disconnect the vacuum line and plug the port at the carb I look underneath and the oil is litterally pouring out at the same place. I reconnect the vacuum and it returns to a quick drip. Whats going on. No leak at the rear valve cover but the driver side tranny is wet with oil. I am at my wits end. Anyone got a clue. Son, 17 yrs.old is coming for Thanksgiving and was trying to surprise him with an off road Jeep
Thanks in advance,
OC

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Old 11-15-2009, 04:50 PM   #2
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Sorry I cant help
but pics might be helpfull
to others that have Exp
with carb YJs
So its the rear main seal?

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Old 11-15-2009, 04:51 PM   #3
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real main may have a worn mark on the crank where the seal rides. But You may have a large amount of blow by and it is forcing the oil out. The PCV system helps but it is not meant to pull against the blowby.
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Old 11-15-2009, 04:52 PM   #4
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If you pop the hose off the valve cover how much air comes out? A little is normal but a large amount is not.
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Old 11-15-2009, 04:58 PM   #5
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That or your putting the seal in backwards. And its easy to do.......
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Old 11-15-2009, 05:54 PM   #6
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Thanks everyone, this has got me real stressed and it's back to work tomorrow. Seals put in correctly, printed out picture instructions and followed to a tee. It's the part that the vacuum plays thats got me. Engine runs strong, lots of power 60-70 psi oil pressure constant until hot then 50-60 psi. I think it may be new engine time....can anyone say 350 swap or should I stay with the 4.2L with some mods?
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Old 11-15-2009, 06:31 PM   #7
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I am all for a new engine. But a cheap JY cherokee engine and your back going........
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Old 11-15-2009, 07:40 PM   #8
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u have to be real carefull with the upper seal get some real slimye grease, like the grease they give u with energy suspensoin stuff. the edge of the block is really sharp and it can scar the edge of the seal . do not force the seal. it should slide in
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Old 11-15-2009, 09:39 PM   #9
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Not sure if this helps, but I recall in another post about rear main seals that if the oil pan gasket is torqued too tight, it can cause a leak. I looked in my service manual and it states to only torque to 84 in-lbs. That is relatively just a bit past snug. Good luck with the repair and I bet your son will love the Jeep.

Jeff

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