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Old 02-27-2012, 02:45 PM   #1
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Rear Main Seal or Oil Pan leak?

I was told by one mechanic that I have a valve cover leak and rear main seal. Replaced the valve cover gasket and mechanic said that may fix it but to watch it and see. The leak continued again, few drops here and there. I figured the RMS indeed was leaking. I went to a different shop b/c they quoted me $100 cheaper to do the RMS. This mechanic didn't think it was the RMS since I only had 83,000 miles on the Jeep(??)--not sure about that reasoning. He said the valve cover was leaking and didn't think the last shop replaced it. Also said he didn't see any oil leaking from the RMS. I had them do it again, got my money back from the other shop.

The leak actually stopped for about 2 weeks. When checking my fluids, I noticed the oil was low and topped it off, maybe 1/2 quart. The leak pretty much came back the next day. Now the leak seems to be getting worse daily, leaking more oil each time.

I crawled under there and took some pics. Any thoughts on what is leaking would be helpful. I'll probably take it to a shop, mainly bc I don't have the time to work on it. I am either working or watching my 3 year old. My 3 year old is not the best helper.

2005 4.0 with 83,000 miles--I apologize ahead of time for the long post

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Old 02-27-2012, 02:55 PM   #2
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Mine has the same leak and looks just like yours. I also have an '05 Rubicon with 72,000 miles. I'm 99% sure its the RMS that is leaking. When you change the RMS you have to drop the oil pan and replace that gasket as well.
Mine didn't have a valve cover gasket leak but the PCV valves were leaking on the valve cover. I replaced the (2) PCV valves and the rubber seals that hold them onto the valve cover. I'm waiting until I install my lift to change the RMS and pan gasket.

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Old 02-27-2012, 02:56 PM   #3
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Rear main seal is a pretty common problem. Mine's been leaking same spot as yours ever since I bought it with 42k on the clock. Just enough to leave a drip or two on the ground.
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Old 02-27-2012, 03:06 PM   #4
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Mine has a leaky rms and looks just like that. ~ 55K mi.
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Old 02-27-2012, 03:08 PM   #5
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There are some stop leak products that actually work. My brother used some brand like gold seal or something like that on a chevy 350. It took a month to stop.
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Old 02-27-2012, 04:01 PM   #6
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Looks like the RMS to me. The valve cover usually leaves the entire back of the block or the rear drivers-side corner covered. The RMS is a very common problem on the I-6, even on low mileage ones. It's not super-horrible to replace since it is a two piece, but at least a couple hours on the floor in the garage. I would advise against additives myself. There are a couple very small oil passages on the motor that I would be afraid would get clogged.
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Old 02-27-2012, 04:11 PM   #7
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My RMS was replaced at 72,000 miles. It HAS to be a design flaw for something like that to go bad at such at early stage. Many on the forum here suggest to look at the valve cover gasket as the possible culprit..... lucky for me, that too was leaking on my I6, so I had them both fixed at the same time.
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Old 02-27-2012, 04:46 PM   #8
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thanks all. Its definitely sounding like it is the RMS, since the valve cover was replaced in january. I figure if those additives even work, they are only a quick fix. I'll probably just bite the bullet and get it taken care of.
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Old 02-27-2012, 04:58 PM   #9
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05 39,000 miles RMS
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Old 02-27-2012, 09:40 PM   #10
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'06 with ~78,000 miles, RMS leak as well. Good times.
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Old 02-27-2012, 10:06 PM   #11
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05 with 68K... leaking RMS... we need to start a club!
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Old 02-28-2012, 05:12 PM   #12
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Just had mine done...replaced the valve cover gasket, oil pan gasket, and RMS...problem solved...or at least for now.
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Old 02-28-2012, 09:04 PM   #13
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97, 118K I have the RMS leak.
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Old 02-28-2012, 09:16 PM   #14
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it definitely seems to be quite common, regardless of mileage. I'll probably just keep an eye on it and watch the oil level. There are a lot of other things my jeep wants right now!
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Old 02-28-2012, 09:31 PM   #15
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My oil leak ended up being the oil pressure sender . The brass elbow on it was very loose. I cleaned it up and put new thread sealer on it and was able to make one extra turn from where it originally was. Washed the bottom of the motor and not a leak to be found. Saved my self some cash and time, for now at least.
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Old 02-28-2012, 09:36 PM   #16
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I have a 97 with 148k. RMS is leaking, and I am waiting on a sunny day to replace it.
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Old 02-29-2012, 07:10 PM   #17
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I brought my 2001 Sport with 74k in today because it was leaking oil. And my local mechanic told me its the RMS... So guess i can join the club. Told me its going to cost me around $200 to fix it
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Old 02-29-2012, 07:13 PM   #18
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Quote:
Originally Posted by sawyert View Post
I brought my 2001 Sport with 74k in today because it was leaking oil. And my local mechanic told me its the RMS... So guess i can join the club. Told me its going to cost me around $200 to fix it
$200 is a good price. Most put 4.5-5 hours labor so about $4-500 I think.
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Old 02-29-2012, 07:35 PM   #19
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$200 is a good price. Most put 4.5-5 hours labor so about $4-500 I think.
yeah 200 is a great price for a mechanic. At a Jeep shop(not a dealer), I was quoted 450 and the lowest quote was 350. The 350 was based on the mechanic looking it up and the instructions saying 3-3 1/2 hours. I would love to find a place for 200.

I may check the oil sending unit. The first shop who said it was the RMS, said that could also be where the leak is.
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Old 02-29-2012, 08:20 PM   #20
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I paid $380 for parts and labor, including the oil change, and cleaning the motor up....minus the valve cover gasket, which I bought a few days earlier. I had new spark plugs in the backseat, and they went and put them in too...no charge on the bill. I think I got a decent price for everything.
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Old 03-02-2012, 09:06 AM   #21
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well, I crawled under the jeep to see exactly where it may be coming from. It wasn't the oil sending unit, definitely seemed to be the rear main seal. With a flashlight, I was able to see that it was coming right from the bottom of where it seals. I figured, it was worth a try and put some RTV around the area. So far no leaking. It may not look pretty and may just be a temporary fix, but better than dropping some cash right now.
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Old 03-02-2012, 09:27 AM   #22
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That doesn't look half bad! I may try that until I save the dough to change it out myself. I was under it last night and it looks like you have to drop the exhaust from the header to the muffler before you can drop the oil pan.
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Old 03-02-2012, 10:08 AM   #23
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Quote:
Originally Posted by superdavis78 View Post
I paid $380 for parts and labor, including the oil change, and cleaning the motor up....minus the valve cover gasket, which I bought a few days earlier. I had new spark plugs in the backseat, and they went and put them in too...no charge on the bill. I think I got a decent price for everything.
Ya thats seems like a pretty damn good deal.

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That doesn't look half bad! I may try that until I save the dough to change it out myself. I was under it last night and it looks like you have to drop the exhaust from the header to the muffler before you can drop the oil pan.
Exactly why i didnt even feel like trying to look myself. Since i got a good deal on it im going to just let the mechanic do it. And replace the valve cover gasket myself after.
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Old 03-02-2012, 10:24 AM   #24
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i just let mine leak, theres enough mud in there to act as RTV. LOL
So far i have never had to add oil so its just a slow seepage.
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Old 03-03-2012, 07:29 AM   #25
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Try one of the engine oils specifically designed for high mileage engines. One of their ingredients is call seal swell... it's purpose is to infiltrate seals and cause them to swell thereby decreasing oil leaking throught them....
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Old 04-05-2012, 06:51 AM   #26
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can I join the club too...2001 TJ 200,000+ miles it has a small drop just like the first pics so I'm guessin it is my rms too...i've suspected it fora while, and I think it's time to do somethin about it
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Old 04-05-2012, 07:05 AM   #27
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I found a leak at the back of the pan too...about two or three drops every few days. In my case all of my oil pan bolts were about 1/3 turn loose. I tightened them and so far the leak seems to have stopped or reduced significantly to where its not marking the floor anymore.

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Old 04-05-2012, 08:21 AM   #28
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no write up on how to fix it?
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Old 04-07-2012, 12:27 AM   #29
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Getting a quote tomorrow to fix mine. 97 4.0 105,00 miles. Doesn't look like fun fix, some things are worth paying for.
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Old 04-07-2012, 06:39 AM   #30
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Quote:
Originally Posted by htkrph
no write up on how to fix it?
Go to You Tube and search. I need to replace mine also and I found a few videos on there how to do it. I haven't done it yet but looks pretty straightforward. I am only concerned about how tough it is going to be to break the bolts loose on the exhaust.

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