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Unread 05-15-2010, 07:51 AM   #1
kennemore_m
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2006 TJ Wrangler 
 
Join Date: Jul 2009
Location: Chattanooga, TN
Posts: 70
Pouring Out Oil - Rear Main Seal?

My 2.5 5speed has had what appears to be a small leak in the rear main seal for a few months. No spots in the driveway however, there has certainly been a small leak coming from the area where the bell housing meets the motor. I was driving recently and when I stopped it was pouring oil out of this area. Not like a drip, more like a small stream. On closer inspection, oil is everywhere, even appears to be spraying out of the hole in the bell housing where the crank position sensor is mounted. The main stream seems to be coming from the area where the bell housing and motor meet. I don't have the equipment or facilities to pull the transmission to fix it. The local shop thinks it is the rms but cannot be sure until they pull the transmision. Very expensive fix for labor.

My main question is can the rms go very bad suddenly like this and start pouring oil and if so, is there a cause for this? Everything I have read seems to indicate they just drip and steadily drip more over time.

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Unread 05-15-2010, 08:43 AM   #2
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,550
There isnt too much there for it to be anything else. If its coming from inside the bellhousing then its the seal. I would call several places and price the seal replacement. Its not that difficult a job to do.
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Unread 05-15-2010, 11:21 AM   #3
SteveJcoYJ
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1991 YJ Wrangler 
 
Join Date: Apr 2007
Location: Vineland, NJ
Posts: 1,709
its not the hardest process to replace it, ive done several 2.5 seals. your just gonna drop the trans, take off the clutch kit and replace the seal, then it goes back together, obviously not as easy as that sounded but its not terribly difficult. if i have more time later i'll get you some pics
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Unread 05-15-2010, 02:58 PM   #4
kennemore_m
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2006 TJ Wrangler 
 
Join Date: Jul 2009
Location: Chattanooga, TN
Posts: 70
Thanks for the help. I could see anything else that it could be but I have never heard of one just going suddenly like this. Has anyone else had this type of experience with a rear main seal suddenly pouring oil?
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Unread 05-15-2010, 09:04 PM   #5
kennemore_m
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2006 TJ Wrangler 
 
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Bump, anyone else had anything like this happen? Any ideas on causes or possibly just normal wear at 130k miles?
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Unread 05-16-2010, 08:13 AM   #6
DonCisco91
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1988 YJ Wrangler 
 
Join Date: Apr 2010
Location: Pennsylvania
Posts: 19
My rear main seal on my 2.5 started pouring oil a couple of weeks a go. We replaced it and the very next day started leaking oil again.
Not sure if we damaged while putting it in or what..very frustrating...
oh yeah and my yj has 77,000 miles..
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Unread 05-20-2010, 12:54 PM   #7
kennemore_m
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2006 TJ Wrangler 
 
Join Date: Jul 2009
Location: Chattanooga, TN
Posts: 70
Update- it was not the rear main seal as I originally thought it was. After pulling the transmission, found that the transmission gearing had knocked a hole in the front plate facing the clutch and was spewing oil out of the hole. Bearings and stuff were all over the place. Picked up a used transmission from a 91 YJ and am in the process of getting it installed.
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Unread 05-20-2010, 01:45 PM   #8
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Ouch, so the oil was from the trans?
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Unread 05-20-2010, 02:22 PM   #9
kennemore_m
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2006 TJ Wrangler 
 
Join Date: Jul 2009
Location: Chattanooga, TN
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Yes, the oil was spewing out of the hole in the front of the tansmission and going all inside the bell housing and apparantly get thrown all over the place by the clutch, flywheel, etc. Was lucky to pick up a transmission out of a 91 for cheap. Would like to have gone with something better but money wise this was the way to go for now. Hopefully the 91 trans will slide in with no problems.
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