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-   -   Rear Main Seal? (http://www.wranglerforum.com/f210/rear-main-seal-226685.html)

jeepwayoflife 03-10-2013 08:19 PM

Rear Main Seal?
 
4 Attachment(s)
Hi guys,
I have never had any problems with my jeep leaking from anything other than my axles until today. I came out in the morning to a clean ground under my jeep as usual. I drove to my friends house (25 minutes on the highway)at normal RPM's and speed, nothing unusual, and when i parked, I noticed oil dripping. When I looked underneath it looks like the oil is coming out from the vent at the bottom of the bellhousing and is also dripping down the back of the oil pan. It is brown and appears to be engine oil, so it this the rear main seal leaking?

One picture shows the spot that formed on the ground after about 45 seconds. I could literally watch it drip out of the bellhousing like a leaky faucet. Another picture shows the spot next to my hand for size comparison. The third picture shows the wet bellhousing and oil pan skid plate, and the last picture shows the drip streaks down the rear of the oil pan.


I was reading the article here: [Repair] Rear Main Seal Replacement
On how to replace it. How easy is it to do and how much would it cost to have a shop fix? My jeep is a 2002 with 43,000 miles on it, synthetic oil change every 3,000 to 3,500 miles.


Thanks

Coop02x 03-10-2013 09:08 PM

If it's leaking as bad as you described, its time to replace it. You are probably looking at anywhere from $300-$500 for a shop to do it (at least around where I live) depending on who you get to do it. I debated on whether to do it myself or not and decided to just go ahead and get a shop to do it. I'm going to another shop tomorrow morning to get another quote before I pull the trigger on mine.

Make sure you keep an eye on you oil level in the mean time!

Munson821 03-10-2013 09:25 PM

Mine is leaking the same amount from the same place as well. I dread having to spend the money to repair it

jeepwayoflife 03-11-2013 12:16 AM

Thanks for the info, hopefully I can get it done for that cheap. If it was $1,000 then I would do it myself, but for $300-400 I would rather have a shop do it to be safe. I checked it again and now there are two spots about the size of my palm. I guess it drips a lot when I first shut it off, but slows down after that. Oil level is still good. I'm just worried about how much leaks out when I'm driving. Seems so odd for this to happen on an engine with low milage and good maintenance. Its only been in the mud a handful of times and is always cleaned well after.

tangofox007 03-11-2013 11:05 AM

Quote:

Originally Posted by jeepwayoflife (Post 3487337)
Seems so odd for this to happen on an engine with low milage and good maintenance.

Age can be just as significant a factor as mileage. And synthetic oil will leak where conventional oil will not.

Not every oil leak from the rear of an engine is from the rear main seal.

jeepwayoflife 03-11-2013 07:18 PM

Got a quote from the shop down the street from me for $425. Thanks for the help everyone!

doclouie 03-11-2013 07:32 PM

Change the oil to a dino oil and the leak may go away. It will not fix the problem, but it may make it not leak.

dale 3 03-11-2013 07:52 PM

Quote:

Originally Posted by doclouie (Post 3490393)
Change the oil to a dino oil and the leak may go away. It will not fix the problem, but it may make it not leak.

What the hell is DINO oil? Straight weight? Flintstones :confused:

UFOtestpilot 03-11-2013 07:57 PM

Quote:

Originally Posted by dale 3 (Post 3490499)
What the hell is DINO oil? Straight weight? Flintstones :confused:

Dino=organic. It is commonly attributed to the decay of dinosaurs that turned into oil deposits. Geologists now know it was actually algae.

Straight weight does not have a range eg; 10-30, but rather comes in straight weight eg; 30w, 50w, etc.

UFOtestpilot 03-11-2013 08:04 PM

Quote:

Originally Posted by jeepwayoflife (Post 3490314)
Got a quote from the shop down the street from me for $425. Thanks for the help everyone!

I will spend an afternoon fumbling with a wrench laying in gravel before I'll pay someone $425 to do anything I can get done myself. Even if only half was labor (which I don't think it is) $212.50 a day is pretty good wages for me. If you have the coin and aren't inclined to mess with it take it to a reputable shop and be prepared for it to start weeping again long before you think it should.

dale 3 03-11-2013 08:16 PM

Quote:

Originally Posted by UFOtestpilot (Post 3490528)
Dino=organic. It is commonly attributed to the decay of dinosaurs that turned into oil deposits. Geologists now know it was actually algae.

Straight weight does not have a range eg; 10-30, but rather comes in straight weight eg; 30w, 50w, etc.

So it has something to do with FLINTSTONES,Hence DINO the dinosaur and his rotted POOP!;)

SurfKaster 03-11-2013 08:38 PM

I changed mine the other week. It really wasn't that bad, down time was maybe 5 hrs or so. I wouldn't do it without an impact wrench though, the exhaust bolts can be a bitch. You can also check the bolts on the oil pan closest to the seal. If they're loose the rear main can appear to be leaking. Also check your valve cover gasket. $400ish is about average for the rear main.

Shark_13 03-11-2013 09:35 PM

Quote:

Originally Posted by tangofox007 (Post 3488569)

Age can be just as significant a factor as mileage. And synthetic oil will leak where conventional oil will not.

Sounds crazy but true...i put synthetic in a mower once (don't ask why i dunno)...that thing leaked all over the garage floor. Put regular stuff in next season, not a drop on the floor.

gquad41 03-11-2013 10:44 PM

Did mine one month ago and got all parts online for around 50 $ . I am handicapped and I did mine in 5-6 hrs fairly simple just follow on line videos .

migbuz 03-11-2013 11:41 PM

OP. Are you sure it's not just a valve cover gasket? Oil will run down the back of the engine.
I was 99% sure my rms was leaking until I started reading a bunch of posts on this topic and decide to replace my valve cover gasket. Haven't seen an oil stain since.

jeepwayoflife 03-12-2013 12:27 AM

Quote:

Originally Posted by migbuz (Post 3491669)
OP. Are you sure it's not just a valve cover gasket? Oil will run down the back of the engine.
I was 99% sure my rms was leaking until I started reading a bunch of posts on this topic and decide to replace my valve cover gasket. Haven't seen an oil stain since.

I believe it is the rear main seal because more oil is coming out of the vent on the bottom of the bell housing than is dripping down the oil pan. While I feel comfortable doing most things on my jeep, I'm only in highschool and have never messed with an engine and if I did something to damage it I would have a real hard time coming up with the money to fix it. I would be fine removing the transmission, clutch, and oil pan, but I don't know how my inexperience would fair against the delicate seal and little retaining piece.. :hide:

Soli Deo Gloria 03-12-2013 06:55 AM

About running synthetic oil. I was talking to a friend of mine who restores cars and he told be that using regular oil is not at clean as synthetic (obviously) but because of that if there are small leaks it could plug and prevent it from leaking. After doing that and changing to synthetic it runs so clean and will clean out all those deposits from old oil and the possibility for leaks begin.

Just a thought

jeepwayoflife 03-12-2013 08:58 AM

I was thinking about that, but I switched to synthetic over a year and a half ago and no leaks until now. I'm due for an oil change anyway so I guess I will try dino oil and see how it does.

dbsanders 03-22-2013 08:14 PM

Shop or Dealer for RMS?
 
Sorry to resurrect a thread. Mine is leaking just a drop a day or so. If I wanted to have a shop do it, is it really something any shop can do, or would the dealer really be better? The DIY I've read had such strong cautions about scoring the metal and getting the surfaces absolutely 100% clean, I'm a bit scared to take it somewhere that might not be as familiar with this engine.

tangofox007 03-22-2013 08:33 PM

Quote:

Originally Posted by dbsanders (Post 3540149)
Sorry to resurrect a thread. Mine is leaking just a drop a day or so. If I wanted to have a shop do it, is it really something any shop can do, or would the dealer really be better?

One forum participant recently reported that her dealer insisted that the transmission had to be removed to replace a 4.0L rear main seal.

Is it something any shop can do? That's a lot like asking if any restaurant can do steak and lobster. In the final analysis, it's a very low tech job, but it does require attention to detail. And you can't get that everywhere.

doclouie 03-22-2013 10:38 PM

Quote:

Originally Posted by tangofox007 (Post 3540231)
One forum participant recently reported that her dealer insisted that the transmission had to be removed to replace a 4.0L rear main seal.

Is it something any shop can do? That's a lot like asking if any restaurant can do steak and lobster. In the final analysis, it's a very low tech job, but it does require attention to detail. And you can't get that everywhere.

That actually is true, depending on the year of the inline 6. Some had two piece seals and some had one piece seals. I do not remember which year is which though.

SurfKaster 03-22-2013 10:39 PM

I'd lean toward a reputable shop over a dealer unless you just have spare $$$ to burn.

outofmoney 03-22-2013 11:03 PM

Check to make sure your oil pan bolts are tight. I thought my rms was bad too but, turned out the leak was at the rear of oil pan!

tangofox007 03-23-2013 12:51 PM

Quote:

Originally Posted by doclouie (Post 3540801)
That actually is true, depending on the year of the inline 6. Some had two piece seals and some had one piece seals. I do not remember which year is which though.

Talk is cheap. Show me in writing.

doclouie 03-23-2013 12:59 PM

Quote:

Originally Posted by tangofox007 (Post 3542664)
Talk is cheap. Show me in writing.

I am not going to waste my time on your challenge as I have better things to do. You can research it out if you really care, but I am sure you are just trying to stir the pot. The 1991 XJ is one example I know for sure.

tangofox007 03-23-2013 01:07 PM

Quote:

Originally Posted by doclouie (Post 3542683)
I am not going to waste my time on your challenge as I have better things to do. You can research it out if you really care, but I am sure you are just trying to stir the pot. The 1991 XJ is one example I know for sure.

No XJ with a 4.0L engine featured a one piece rear main seal. (Maybe you are thinking of the "inline 6" that had only four cylinders!!!)

If you don't have time to "waste" determining the facts, perhaps you should allocate less time to supplying erroneous information.

doclouie 03-23-2013 01:42 PM

Quote:

Originally Posted by tangofox007 (Post 3542703)
No XJ with a 4.0L engine featured a one piece rear main seal. (Maybe you are thinking of the "inline 6" that had only four cylinders!!!)

If you don't have time to "waste" determining the facts, perhaps you should allocate less time to supplying erroneous information.

I owned a 1991 XJ and it did have a 1 piece rear main seal that I had the dealer change out because of the labor and yes it was an inline 6.

tangofox007 03-23-2013 01:50 PM

Quote:

Originally Posted by doclouie (Post 3542791)
You are wrong. I owned a 1991 XJ and it did have a 1 piece seal that I had the dealer change out because of the labor and yes it was an inline 6.

In that case, it should be no problem for you to post the part number for that one piece Jeep 4.0L rear main seal.

Looks like hoodwinking customers is a common dealership tactic; they got you!!!

jeepwayoflife 03-23-2013 02:13 PM

I ended up putting me replacement off for a while. The leak seems to have really slowed down, only a few drops after sitting all night and oil level stays normal. The leak must have gotten plugged with some gunk :thumb: buys me some time to save money for the replacement. The shop down the street from me will do it for $400 and I'm bringing the oil I like.

doclouie 03-23-2013 02:34 PM

Quote:

Originally Posted by tangofox007 (Post 3542809)
In that case, it should be no problem for you to post the part number for that one piece Jeep 4.0L rear main seal.

Looks like hoodwinking customers is a common dealership tactic; they got you!!!

I am done with this conversation. I see from your past experiences that you like to stir things up and I will not be sucked into that. Believe me or not I do not care. Have a great day.


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