Rear main info please!! -
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Unread 08-16-2013, 08:31 PM   #1
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2005 TJ Wrangler 
Join Date: Apr 2012
Posts: 8
Rear main info please!!

I'm in the middle of replacing the rear main and pan gasket on my 2000 cherokee with the 4.0. My question is if the rear main was really leaking wouldn't torque converter have oil on it also? Any help would be awesome. Thanks

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Unread 08-16-2013, 08:46 PM   #2
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,046
The flexplate would.

Rear main seal is frequently misdiagnosed.

I'd be looking up ABOVE first, and VERIFYING the source of the oil leak YOURSELF.

Everybody, who doesn't own or have to pay for or perform your vehicle repairs, loves to poke their noggin UNDER the Jeep and come out bearing the false bad news that your RMS is leaking.

Many mechanics, friends, people on Jeep forums who can’t see your Jeep from where they’re at, and good old Uncle Bob seem to enjoy telling you it’s the rear main seal. Has a catastrophic ring to it, doesn’t it?

A simple leak at the back of the valve cover or other source could produce the same symptoms. You don’t need to be a mechanic to figure this out. If you have good eyesight and a dim flashlight, you’re good to go on your own. Don't jump on the RMS/oil pan gasket bandwagon right off the bat.

Almost any oil leak on your 4.0 is gonna drip from the RMS area for two simple reasons.

First off, the engine sits nose-up and any oil will run back to the RMS area. Secondly, the RMS area is also the lowest point on the engine. Simple physics and the old plumber's adage apply here. "***** flows downhill".

Valve cover gasket, oil pressure sending unit, oil filter adapter seals and distributor gasket, in that order, have to be eliminated as possibilities first.

Revised 02-26-2013
Originally Posted by chris87xj View Post
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Unread 08-16-2013, 09:04 PM   #3
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Well I did start at the top of the motor. I replaced the valve cover gasket and then the oil filter adaptor. I've check everywhere else also. And the spot on the driveway pionts to anthoer spot lol. I've already dropped the pan and began to clean everything but the flex plate and torque converter area are clean. I was thinking of only doing the pan gasket beacuse i was thinking if it was really the rear main, that area would also have oil in it also. Thanks for the input
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Unread 08-16-2013, 11:08 PM   #4
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Flex plate and torque converter spin so fast, that any oil that might drip on them gets slung off.
The road goes on forever, the party never ends....
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Unread 08-16-2013, 11:16 PM   #5
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But wouldn't there be oil in the bell housing though?
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