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Old 01-06-2011, 02:38 PM   #1
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rear engine oil leak

Hi Folks-- I am new to this forum but being a member of the VRCC forum (VALKYRIE RIDERS CRUISER CLUB) I know that valuable information can be passed along to fellow enthusiasts. My Jeep Wrangler is a 2004 Sahara with 45,000 miles on it bought used a year ago. When I bought the Jeep from the dealership I had them put it on a lift so I could take a look at the rear seal as my previous Wrangler had to have the seal replaced twice. There was evidence of a leak as ther was oil coming from behind the inspection plate to the bell housing. The mechanic removed the plate and there was no evidence of a leak on or around the front of the flywheel so he says that it must be residue from the oil change he had done on it. The leak is still there and I am in the last month of my warranty. Sorry for the length- my question is : if the Jeep has a rear oil leak and there is no evidence behind the inspection cover, on the flywheel or in the housing can it still be the rear seal? or just a leak from around the rear of the oil pan. Thanks in advance for your help.

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Old 01-06-2011, 03:06 PM   #2
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Quote:
Originally Posted by goldenwing01 View Post
Hi Folks-- I am new to this forum but being a member of the VRCC forum (VALKYRIE RIDERS CRUISER CLUB) I know that valuable information can be passed along to fellow enthusiasts. My Jeep Wrangler is a 2004 Sahara with 45,000 miles on it bought used a year ago. When I bought the Jeep from the dealership I had them put it on a lift so I could take a look at the rear seal as my previous Wrangler had to have the seal replaced twice. There was evidence of a leak as ther was oil coming from behind the inspection plate to the bell housing. The mechanic removed the plate and there was no evidence of a leak on or around the front of the flywheel so he says that it must be residue from the oil change he had done on it. The leak is still there and I am in the last month of my warranty. Sorry for the length- my question is : if the Jeep has a rear oil leak and there is no evidence behind the inspection cover, on the flywheel or in the housing can it still be the rear seal? or just a leak from around the rear of the oil pan. Thanks in advance for your help.
clean the leak up and see where its coming. until then its all guessing.

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Old 01-06-2011, 03:28 PM   #3
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The 4.0L is notorious for rear main seal leaks... if you have to drop the oil pan to replace the pan gasket, might as well replace the main seal while you are in there. Kill 2 birds with one stone and being a little preventative while you're at it.
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Old 01-06-2011, 05:08 PM   #4
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That's just great, I have a 2001 6 cyl and didn't realize this problem existed. My diesel motor home is notorious for a fan bearing failure that can put the fan through the radiator and the Norcold refrigerator has a freon leakage failure that can cause a fire and burn the MH up.
Guess with quality control what it is these days us poor consumers just have to put up with it or do without the product. And the manufacturers know what suckers we are.
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Old 01-06-2011, 05:31 PM   #5
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Well with the 4.0L being an inline 6 cyl, and the crank being soo heavy, the seal can wear out prematurely. I've never had issues per-say, but I did replace the one in my XJ a few years back without signs of it leaking since. My TJ on the other hand has yet to develop one and it's a '97.
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Old 01-06-2011, 06:01 PM   #6
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Thanks for the replies-- I pulled the inspection plate today and there is no sign of leak on the flwheel or in the housing but oil is definitely coming from under the black hard rubber half do- nut at the rear of the oil pan. Is that part of the oil pan gasket, a dust seal or the engine seal. Thanks

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