Replacing Rear Main Seal -
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Unread 11-05-2012, 09:01 PM   #1
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1987 YJ Wrangler 
Join Date: Apr 2011
Location: Adelanto, California
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Replacing Rear Main Seal

So just bought this 87 Wrangler 4.2 with 118000 miles on it and after going through and tinkering with the carb and other issues to get it running nice, I have noticed that the rear main crank seal is leaking pretty good.

How do I change it without dropping the tranny?

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Unread 11-05-2012, 09:10 PM   #2
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1989 YJ Wrangler 
Join Date: Jun 2011
Location: Houston, TX
Posts: 347
Do some searching on the site. There's plenty of threads dealing with this. Basically, you drop the pan and remove the bottom half of the rear crank bearing and remove it in two pieces. The Haynes manual tells you how as well.
1989 YJ - 4.0L
2001 WJ 4.0L
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Unread 11-05-2012, 11:19 PM   #3
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1989 YJ Wrangler 
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Here are a couple of Utube videos Part I/II shows you all with some pretty good tips.

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Unread 11-05-2012, 11:38 PM   #4
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1995 YJ Wrangler 
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Welcome to the forums. Your problem is common, try using search Google: " then your search terms"

Then check the FAQs.
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Unread 11-06-2012, 06:04 AM   #5
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1993 YJ Wrangler 
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All of the above. I've replaced mine too many times but the seal I had most success with was the single lip. The double lip ones always seemed to leak right after. Of course maybe I was not doing it right.

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Unread 11-06-2012, 11:27 AM   #6
from here it gets rough
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1993 YJ Wrangler 
Join Date: Dec 2007
Location: Beyond Honolulu
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Dirty but satisfying job. Make yourself a brass punch from a brass dowel rod, that way when you punch out your old seal from the block, you minimize the risk of damaging critical surfaces. Use a Felpro one-piece pan gasket, and when you remove all the pan bolts, punch them thru a piece of cardboard that you have drawn out the gasket outline on so that you put them back in the right holes. There are different lengths and sizes involved, some are stud top bolts, etc and it's best to get them all back in the right holes. The cardboard trick will solve that issue. The 4 cylinder requires pulling the tranny, but you can do it with the tranny in on the 6 cylinder. If the videos and threads you find do not seem to be adequate, post back in and I'll help you search for more threads.
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Originally Posted by Brian4.2 View Post
We will be going Metric every inch of the way.
Originally Posted by 40dog View Post
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
Originally Posted by Virjeep View Post
You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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