Rear main oil leak. Worth replacing? -
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Unread 09-08-2012, 08:08 PM   #1
1993 YJ Wrangler 
Join Date: Aug 2012
Location: , Washington
Posts: 97
Rear main oil leak. Worth replacing?

My rear main seal is leaking. Veeerry slowly. Couple drops a week. My drain plug on the tranny is drippin also, a little heavier. Ive been looking all over. Where can I find a replacement 1993 jeep wrangler HO 4.0 I6 5 speed manual transmission,drain plug. Any suggestions would be appreciated.

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Unread 09-09-2012, 06:22 AM   #2
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2002 TJ Wrangler 
Join Date: Mar 2010
Location: Akron Ohio
Posts: 675
I'd just wrap the threads on the drain plug with some teflon tape and call it a day.
"I had wobster at Wed Wobster" - Austin age 5

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Unread 09-09-2012, 06:56 AM   #3
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2005 TJ Wrangler 
Join Date: Jan 2008
Location: Racine, WI
Posts: 322
My rear main seal was the same way, a couple drops a week for about 1.5 years. Then I went on a 4 hour drive to my parents and started to smell oil burning, it was the rear main slowly dripping on the exhaust... Then I knew I had to change it, didnt want to be in a bad situation when it really gave out. I would say keep an eye on it and keep checking the oil weekly then if something happens just be prepared to $ or since you have time read up on how to do it. It's farely simple just time consuming.
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Unread 09-09-2012, 07:53 AM   #4
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,931
I'd be looking up above first, and VERIFYING the source of the oil leak yourself. Many mechanics, friends, and good old Uncle Bob love to tell 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, you’re good to go on your own. Don't jump on the RMS/oil pan gasket bandwagon just yet.

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 8-15-2012
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