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Old 05-11-2012, 05:51 PM   #1
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rear main seal leak or transmission leak??

ik this has come up about a billion times...but i can't seem to find anything that addresses this exactly. i have what i thought to be a small rear main seal leak (bout 3 drops per day) but when i decided to smell the oil dripping i found it has no scent whatsoever???? now im worried cause i smelled some of my motor oil and it smells pretty strong. am i leaking tranny fluid?? its dripping off the point on the bell housing by the bolt. hope the pics help. one is of the rear main seal area between the bell and the engine.
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Old 05-12-2012, 01:47 AM   #2
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could be a front input shaft seal. or, a leak from the slave cylinder on the clutch. what year of jeep and what trans in it?

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Old 05-12-2012, 11:05 AM   #3
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It's a 1994 yj. I believe it has the ax-15. I thought about the slave cylinder but my clutch fluid smells pretty strong.
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Old 05-12-2012, 12:44 PM   #4
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Depending on what you have in the trans, if its 75/90, it has a very strong and distinct odor...
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Old 05-12-2012, 07:43 PM   #5
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yea that's what i thought but i don't know what the PO has in it. im assuming its just the RMS cause its wet all around that area...i still can explain why it dosnt smell unless mixing with the clutch dust somehow kills the smell lol. the leak has kinda been put on hold for my newest issue...my gauge tells me im overheating but ik it not. so now i gotta deal with that. this jeep is nothing but headaches.
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Old 05-12-2012, 11:27 PM   #6
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it could still be the input shaft seal, if the PO put synthetic in it (which is a common practice with the AX15)

the synthetic that i have in mine has very little odor to it at all. but even if it was a few drops would take a long time to end up being low. the AX15 holds 3.25 qts.

does it have synthetic oil in the motor by chance?
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Old 05-14-2012, 09:18 AM   #7
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Same leak on mine and the tranny is off right now. On mine, it was the bearing plate on the front of the transmission. I had ordered a gasket for it from Quadratec but it didn't fit so I used permatex Ultra Black.
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Old 05-14-2012, 01:42 PM   #8
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oil leak

Dont know if this was done already: wipe again all around the areas, back of oil pan and bell housing, now stuff a rag like those blue ones from the parts store into the slots of the bellhousing snug enough to keep from blowing out during your travels check it after a couple of days. A daily check to ensure the "test paper" is in place. Blow-by from the engine rear main wont show on the top(inner) part of the test paper. Both seals are a hassle to replace, even the hydra clutch was real fun putting the tranny/housing back inplace. And I was using a descent tranny jack.
If your leak is the Tranny input seal, the diaper(test paper) will help keep your concrete drive a lil cleaner
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Old 05-14-2012, 02:44 PM   #9
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Quote:
Originally Posted by 0III0forlife View Post
it could still be the input shaft seal, if the PO put synthetic in it (which is a common practice with the AX15)

the synthetic that i have in mine has very little odor to it at all. but even if it was a few drops would take a long time to end up being low. the AX15 holds 3.25 qts.

does it have synthetic oil in the motor by chance?
im not sure what the PO has in it...i know it was changed right before i bought it and i haven't had to change it yet. smells like non synthetic tho. ive never used synthetic in my trucks so im not sure what that would smell like.

even if it is the input shaft seal im just gonna let it be...its a really slow leak.
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Old 05-15-2012, 05:22 AM   #10
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It wouldn't be a bad idea to replace the rear main seal anyway. Its about 7 dollars when I bought it and it definitely helped with my leak. Imagine a red jeep going down the road and smoke bellowing out of the back. I replaced it and it was good to go. Simply put, just lift the jeep, drain oil, remove oil pan, remove rear main seal cover (a big block of metal held by two bolts), push gasket out and lightly oil new gasket, insert and you should be done. The old gasket might stick so you would need some minor tools to scrape it off.

When you are here at this point, I would also replace the oil pan gasket too, it'll come loose and torn up, use the rubber not the cork, IMO I think it's better, reverse order of steps and go for a drive.

If there is anything else that you need to do at this point, I would go and do it now since you have everything down, such as replace the oil pump. Hope this helps, it's alot less expensive. I called a shop and they wanted to charge me about 300 dollars and a week with the jeep. It took me a few hours, of course I took my time too.


Good Luck.

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