D2 A8/S8 (1997 - 2003)
All messages | Search Forums | Return to D2 A8/S8 (1997 - 2003)
Front engine "snubber" mount and leaking tailshaft seals
Posted by: JFrahm (4193) on 2017-11-09 18:05:18

Share | Report
On my 2001 A8 SWB I've had a tailshaft seal leak off and on for a while. My most recent fix lasted over 10K miles, in that instance I put on a "speedi-sleeve" to renew the counterface, cleaned the flange and painted it with rust converter, and used a new Timken seal with Gabor's garter spring trick to get more seal tension.

Well it worked for a long time but not forever. It's been seeping a bit for the last 8 months and now is getting pretty smelly at intersections. It did last over 10K miles and now I am at about 15K miles on the repair.

I have read that people have noticed a wear pattern that suggested the flange shaft was pumping in and out of the seal and leaving a sinusoidal wear pattern. I wondered about worn bearings in the center diff, a worn driveshaft bearing, or... what about the front engine mount, some call it a torque dampener, part 4D0 199 267 ? A recent thread on AW talked about replacing this part and I had to admit I'd never paid the little spud any mind.

Sam described how to see if this mount is split (load the brakes with the car in reverse) and I could see the engine rear up more than seemed fair, and with a snake scope pointed at this mount, which is located near the alternator, I am pretty sure I saw the rubber part separate from the metal cup.

This makes me think the engine could rock like a rocking-horse a bit while I am driving and that would for sure wear on the output shaft seal. I plan to get this mount replaced before I replace the output shaft seal (again). I suggest anyone who has replaced this seal check this engine mount, maybe that's where the excess seal wear is coming from.

Thanks Sam,
post follow up

You must be registered and logged in to post. Please select an option:

Login with existing account
Create a new account

All messages | Search Forums | Return to D2 A8/S8 (1997 - 2003)