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Old 10-08-2013, 05:44 PM   #1
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Leaking Rear Main Seal only when hot after driving.

Hello,

I'm very new to Wranglers, I just bought an '03 4.0 this summer with 89k miles and it's nothing but issues. The dealer is over working with me on it. Anyways, it was free of leaks for a while but now only after I drive it there will be a couple small drops that appear to drip off the oil pan drain screw, but further inspection it runs down from the big seal on trans. This appears to be the rear main seal after several web searches. So, I'm confused as to why it only drips a couple drips when it's scorching hot, but nothing after that. Is it because of pressure or the oil being thinner by chance? Secondly, I've read after the seal is replaced it still leaks a little sometimes. The dealer said they replaced the front seal, but I thought they were talking about the differential box because the rear one was leaking, so I'm not sure if anyone actually touched it or not.

I guess I really want to know if I should do anything about it or just shrug it off and put something under it to catch the drip. Keep in mind this is a just a toy vehicle, not my everyday driver. I run it on Sat/Sun if it's nice out only and winter is coming so in NE Ohio it will just sit for a while.

Also, would it be worth trying the oil additive bar's leak or something like that? Anyone have luck with that stuff? It's cheap so can't hurt I suppose.

I know little about mechanics on these things, so please let me know your thoughts.

Much appreciated!!!!

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Old 10-08-2013, 06:18 PM   #2
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I personally can't have anything on my jeep leak or be low or go over due for service I noticed my rear main seal leaking I'm changing it this week. If I were you I would just drop the pan an change it it doesn't take much time do it I would just spend an hour or two an just do it

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Old 10-08-2013, 06:27 PM   #3
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Quote:
Originally Posted by biglurch00 View Post
Hello, I'm very new to Wranglers, I just bought an '03 4.0 this summer with 89k miles and it's nothing but issues. The dealer is over working with me on it. Anyways, it was free of leaks for a while but now only after I drive it there will be a couple small drops that appear to drip off the oil pan drain screw, but further inspection it runs down from the big seal on trans. This appears to be the rear main seal after several web searches. So, I'm confused as to why it only drips a couple drips when it's scorching hot, but nothing after that. Is it because of pressure or the oil being thinner by chance? Secondly, I've read after the seal is replaced it still leaks a little sometimes. The dealer said they replaced the front seal, but I thought they were talking about the differential box because the rear one was leaking, so I'm not sure if anyone actually touched it or not. I guess I really want to know if I should do anything about it or just shrug it off and put something under it to catch the drip. Keep in mind this is a just a toy vehicle, not my everyday driver. I run it on Sat/Sun if it's nice out only and winter is coming so in NE Ohio it will just sit for a while. Also, would it be worth trying the oil additive bar's leak or something like that? Anyone have luck with that stuff? It's cheap so can't hurt I suppose. I know little about mechanics on these things, so please let me know your thoughts. Much appreciated!!!!
It is said that Jeeps mark their territory. Your problem is not out of the ordinary for a generation of vehicles that are, at the newest, 8 years old.

The AMC six is simple; it has a split style rear main seal that is an easy fix for a competent mech; the oil pan gasket is normally replaced with that procedure. Experienced owners/techs can usually determine a leaky rear main without too much trouble, while dye added to the engine oil is used frequently on newer or more complex powertrains. Old-timers would take a steam jenny and after degreasing everything, run it for awhile and recheck. Stop leaks are generally ineffective, as they do not fix the fault.
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Old 10-08-2013, 06:37 PM   #4
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I was looking up the same info today, as I bought a 97 recently and while snooping around underneath it, noticed oil grime between the engine and tranny. I don't necessarily have any oil leaks on the floor though.

Look up a couple videos and search a bit for pictures of the replacement. It looks fairly cut and dry from what I can see (drain all oil,remove starter, remove oil pan...replace seal. Also get a new seal for the oil pan and reinstall). My first thought though was "shit...I'm going to habe to drop the tranny" or something..whihc I've never done. Looks like I won't.

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Old 10-08-2013, 06:48 PM   #5
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Replacing the rms isn't hard, just a little time consuming. But before you do it, make sure that's where the leak is. Our valve covers are also known to develop leaks especially at the back, and oil can run down the back of the engine making it appear that the rear main is leaking. The valve cover gasket is easy to change so clean your engine off and make sure and check before you do it.
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Old 10-08-2013, 07:10 PM   #6
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X2 on the valve cover
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Old 10-09-2013, 10:29 AM   #7
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Thanks all! Do you think it would be a big deal if I just left it alone? Seems I only get a couple drips after running it and that's about it. I really don't have the tools or know-how to make undergo replacing it myself and I've tied a lot into this thing already, so I really don't want to shell out for something trivial like this.

Thanks again.
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Old 10-09-2013, 10:35 AM   #8
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Quote:
Originally Posted by biglurch00 View Post
Thanks all! Do you think it would be a big deal if I just left it alone? Seems I only get a couple drips after running it and that's about it. I really don't have the tools or know-how to make undergo replacing it myself and I've tied a lot into this thing already, so I really don't want to shell out for something trivial like this.

Thanks again.
No big deal to leave it, just check your oil level every so often.
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Old 10-09-2013, 10:43 AM   #9
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I personally have never seen an I6 Jeep without an RMS leak.
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Old 10-09-2013, 10:44 AM   #10
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Quote:
Originally Posted by ed0985587 View Post
I was looking up the same info today, as I bought a 97 recently and while snooping around underneath it, noticed oil grime between the engine and tranny. I don't necessarily have any oil leaks on the floor though.

Look up a couple videos and search a bit for pictures of the replacement. It looks fairly cut and dry from what I can see (drain all oil,remove starter, remove oil pan...replace seal. Also get a new seal for the oil pan and reinstall). My first thought though was "shit...I'm going to habe to drop the tranny" or something..whihc I've never done. Looks like I won't.

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I think maybe you should replace that pan and look into an oil pan skid plate
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Old 10-09-2013, 10:57 AM   #11
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I think maybe you should replace that pan and look into an oil pan skid plate
Ya I am in complete agreement. There is a dent in the bottom of the pan, but no crinks or cracks etc. I bought it this way about 2 weeks ago, so this is something on the to do list for my build (new rear main, new pan and armor).
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Old 10-09-2013, 11:20 AM   #12
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I personally have never seen an I6 Jeep without an RMS leak.
Mine doesn't leak, and when it starts to, I'll fix it....I hate leaking vehicles..!
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Old 10-09-2013, 11:36 AM   #13
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Many people have replaced the RMS just to find out it was the back of the Valve Cover leaking. Check that gasket first!
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Old 01-22-2014, 08:51 PM   #14
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I think I have a rear main seal leak... I say think because that's what appears to be the most common culprit from the reading I've done, but I'm no expert. I've tried finding the source but not had any luck with the limited daylight that I have after getting off work. Finding the leak is definitely step #1.

I found a good write up on how to do the work myself, but the guide didn't list any part numbers. Does anyone have a guide that does?

Also this is an 06 LJ Rubicon, 6spd. Not what my profile says...

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