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General Category => General Discussion => Topic started by: unclepete on August 28, 2016, 04:04:46 PM

Title: Oil leak at back of transmission 850T-3
Post by: unclepete on August 28, 2016, 04:04:46 PM

I have transmission oil leaking where the thrust bearing outer body exits the cover .
First time noticed ; trans is still full .
Is there a part that "usually" fails ? I see an O-ring in the parts diagram .
Looks awkward to get to . Can it be repaired in place ?
Thanks in advance .

Title: Re: Oil leak at back of transmission 850T-3
Post by: pete roper on August 28, 2016, 04:14:46 PM

O-ring sits in the outer thrust cup. Drop off the clutch arm and, on a T, maybe the brake linkage and you should be able to pluck it out without even removing the swingarm.

Pete

Title: Re: Oil leak at back of transmission 850T-3
Post by: pehayes on August 28, 2016, 05:28:36 PM

Good reason to inspect the throwout bearing.  Often it is bits of the bearing cage which tear up the o-ring.  Bearing is cheap insurance.  Just replace it and the o-ring.

BTW, if the rear cover bore has been damaged, I can install a stainless sleeve to restore it.  But, you'll have to disassemble the transmission for that work.

Patrick Hayes
Fremont CA

Title: Re: Oil leak at back of transmission 850T-3
Post by: unclepete on August 28, 2016, 09:32:37 PM

Got it apart and back together . Bearing looked good , Replaced the o-ring . It was a little flattened , not much . Thanks again .