Changing a Rear Main Seal - JeepForum.com

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post #1 of 21 Old 12-27-2010, 12:45 PM Thread Starter
Irishcopper
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Changing a Rear Main Seal

I'm the original owner of a 2001 Jeep Wrangler with a 4.0 engine with 81K miles and 5 speed manual transmission. I've maintained my Jeep in accordance with Jeep's scheduled maintenance and it's served me quite well. Last week I noticed some dime sized spots of oil in my carport. I checked the oil level and was down half a quart. I topped the oil level off and have been monitoring it daily. Based on where it's originating from the oil appears to be the result either a valve cover leak OR from the rear main seal. I don't have the means to work on the Jeep myself but I've found a ASE certified mechanic that has a good reputation with Jeep owners to troubleshoot the leak and make the necessary repairs. If the oil is originating from the rear main seal is there anything else I should have them replace while they have the transmission pulled? A friend suggested replacing the clutch kit and slave cylinder as they are both original. Given the majority of the mechanics bill will be for labor do you think it would wise to get all of this accomplished at once, or is it overkill? This is my primary mode of transportation and want to keep it running well and out of the repair shop! Thanks!

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post #2 of 21 Old 12-27-2010, 12:55 PM
unlimited4x4
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To replace the rear main seal I believe you only need to drop the oil pan, and a few bottom engine components based on the write ups I have reviewed, not the transmission. Mine is leaking as well.

Here is a good write up:tek-tonic

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post #3 of 21 Old 12-27-2010, 01:01 PM
Sirwriter
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I'm dropping my tranny to replace it with a rebuilt one. Even though the clutch works fine, I'll put a clutch kit and slave cylinder in it simply because of the time and hassle of yanking everything out to get to it if it does go bad. Mine's not the original, but it has about 85K on it. If you have a mechanic do yours, it would cost a lot less to do it now with the tranny out than to have to go back in at a later date and do it from scratch. Mine's a 99 TJ. I'd vote to replace it now.

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post #4 of 21 Old 12-27-2010, 01:05 PM
mdm
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The transmission does not have to be removed to replace the 4.0L rear main seal. 81K is probably about half the life of the OEM clutch for most people. Replacing the clutch would significantly increase the cost of both parts and labor.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #5 of 21 Old 12-27-2010, 01:05 PM
unlimited4x4
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Makes sense now.

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post #6 of 21 Old 12-27-2010, 01:47 PM
Sirwriter
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Quote:
Originally Posted by unlimited4x4 View Post
To replace the rear main seal I believe you only need to drop the oil pan, and a few bottom engine components based on the write ups I have reviewed, not the transmission. Mine is leaking as well.

Here is a good write up:tek-tonic
I didn't know you could replace the rear seal that easily. In my case, I still think it is a good economic move to replace the kit while the tranny is out, since I'm replacing the tranny. Not that much more money and takes only a little while longer.
By the way, that's a very good write up!

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post #7 of 21 Old 12-27-2010, 02:01 PM
Lv03JeepTJ
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Does this also go with automatic transmissions? 2003 Wrangler with a 6cyl. Thanks!!
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post #8 of 21 Old 12-27-2010, 02:07 PM
mdm
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Quote:
Originally Posted by Lv03JeepTJ View Post
Does this also go with automatic transmissions? 2003 Wrangler with a 6cyl. Thanks!!
Yes.

Welcome to the forum.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #9 of 21 Old 12-31-2010, 10:10 AM Thread Starter
Irishcopper
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Thanks to those of you that provided me your recommendations regarding my 2001 Jeep Wrangler. The oil was leaking from both the rear main seal and valve cover gasket. As several of you mentioned the transmission DID NOT need to be removed and my mechanic only needed to pull the oil pan to change the rear main seal. This mechanic has a reputation for being honest and doing good work, but I was glad to have some insight about how to troubleshoot this leak before taking it to his shop.

Ya'll have a safe and Happy New Year!

Cheers!

Irishcopper
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post #10 of 21 Old 12-31-2010, 11:29 AM
oakmckinley
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Quote:
Originally Posted by unlimited4x4 View Post
To replace the rear main seal I believe you only need to drop the oil pan, and a few bottom engine components based on the write ups I have reviewed, not the transmission. Mine is leaking as well.

Here is a good write up:tek-tonic
I am going to bookmark that write up, its great!
Thanks for including it!

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post #11 of 21 Old 01-01-2011, 11:24 AM
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post #12 of 21 Old 01-01-2011, 12:37 PM
chris142
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Before you spend the $$$ to replace the rear main check the oil pan bolts in the area near the 2 Precats. I think that the heat from them makes the bolts loosen. I've fixed 3 Jeeps now just by tightning those bolts.
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post #13 of 21 Old 01-03-2011, 07:59 AM
mdm
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Quote:
Originally Posted by Sirwriter View Post
I didn't know you could replace the rear seal that easily. In my case, I still think it is a good economic move to replace the kit while the tranny is out, since I'm replacing the tranny. Not that much more money and takes only a little while longer.
By the way, that's a very good write up!

Sirwriter
You do have to remove the transmission to replace the rear main seal. You have the 4 cylinder which uses a one piece seal. The 6 cylinder uses a two piece seal.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #14 of 21 Old 01-03-2011, 08:09 AM
Sirwriter
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Quote:
Originally Posted by mdm View Post
You do have to remove the transmission to replace the rear main seal. You have the 4 cylinder which uses a one piece seal. The 6 cylinder uses a two piece seal.


Thanks for the heads up. I'm yanking out the clutch, the tranny, and the transfer case this week. I would have wondered WTF???
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post #15 of 21 Old 12-28-2011, 03:17 PM
boydbe
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4.0 rear main seal

I have removed the two bolts for the rear main bearing cap and it won't budge. Any recommendations?
Thanks,
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