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I was going to make this same suggestion! Good call Clayton. Use RTV (very thinly smeared on the seal outer diameter) and guide the seal on over the shaft. The seal is not a tight fit into the case which surprises me. The last time my transmission was worked on at a BMW shop the mechanic used one hellabunch of RTV (much overkill) but it was sealed tight.clayton said:I have had the same problem when my clutch and seals were replaced. The shop replaced two trans output shaft seals and each time the seal was installed correctly, and showed no signs of damage upon installation. The third and last seal installed the shop installed, put a thin layer of silicone in the small groves that are in the seal surface then installed. It has been a couple thousand miles now and no leaks. I have spoke to several dealer service departments and this seems to be the correct fix.
Clayton's post sounds like putting silicone on the internal diameter seal surface (rotating surface) and ErnieA's post sounds like silicone around the outside diameter which I assume is a press fit seal into the transmission case.clayton said:... The third and last seal installed the shop installed, put a thin layer of silicone in the small groves that are in the seal surface then installed. ...QUOTE]
Originally Posted by ErnieA
.... Use RTV (very thinly smeared on the seal outer diameter) and guide the seal on over the shaft. The seal is not a tight fit into the case which surprises me. The last time my transmission was worked on at a BMW shop the mechanic used one hellabunch of RTV (much overkill) but it was sealed tight.
The silicone is to be used on the outer diameter of the seal where it presses into the transmission case.jrh2020 said:I'm confused...
Clayton's post sounds like putting silicone on the internal diameter seal surface (rotating surface) and ErnieA's post sounds like silicone around the outside diameter which I assume is a press fit seal into the transmission case.
The original thread would seem to indicate gaps between the seal surface and the rotating shaft.
Given that the silicone is a much softer material than the seal lip, would be surprised that it would hold up as long as a well fitting seal on the ID, on the press fit side it would seem to be a good precautionary measure.
I think Dan Martin tried a ...x7 and it didn't work for him and went back to a ....x6 with success. Looks like the real secret is the ....x7 with the tighter spring. That's what I'll use the next time. Thanks for posting. We had another member here that went through four seals and still had a leak. Was begining to think there was a bad production run.aztechmaster said:OK solved it!.. :dance: After some thought, I simply found a correct sized seal in a local bearing/seal warehouse, 25X40X7. I then removed the garter spring, unscrewed it, then snipped about 1mm from its length. I screwed it back together, slipped it back into the groove in the seal, and carefully installed it. MUCH tighter fit, and NO leaks! Check out the pictures, you can see the smaller garter spring!