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Hi,
Appreciate this is an old thread but I replaced by diff side bearings and still have some noise (which disappears momentarily on lift off). I removed the cardan shaft and the noise completely disappeared on power but then was worse on lift off. I'm thinking it may be the pinion shaft bearings? I inspected the best I could without tearing apart but couldn't get enough torque to take the pinion nut off. I put it back together knowing at least it wasn't about to explode but I would like to get rid of the noise. Did you make up some sort of fixture to take the pinion shaft nut off which locks the output flanges? Any advice would be great!
I'm in the process of tearing down my front diff. from a MY 03 996 TT in order to rebuild it. Can anyone comment on how the pinion nut was removed as well as a part list for rebuilding the unit? Any advice would be very much appreciated!
If the same component is going back in the transmission that was taken out, there should be no issues. I assume you changed the bearing? There was most likely some very thin shims behind it to properly space it to the casing, but don't know for sure as it is a single row, deep groove ball bearing.
The outside diameter of the bearing is a clearance fit to the inside diameter of the housing, and if it's the same component group that came out with exception of the bearing, it should be no issue.
I would think there would be NO pre-load on that bearing, but an axial clearance to the housing. So just install and tighten away. If it binds up before the flange bottoms out, then something isn't right.
You are right, the bearing was changed, but there were no shims!
When I put the cover with the assembly back on the housing, there is a resistance
between the bearing and the housing! That made me feel, that it needs to be pressed in somehow! I can not just push it in by hand!!
Use bolts of the housing to press it back in. But go evenly by tightening the bolts on opposite sides (like you would install a wheel.) Tighten them in stages; first time around half way, second 3/4, third seat, fourth torque to spec. This will press the housing back in evenly.
As with any press fit bearing, putting it in the freezer overnight before the install, will make it go in much easier
That's a great idea and what should be done.
Additionally, clean the housing where the bearing sits very well with some brake cleaner and scotch bright pad or something of the sort. This will polish it and remove any high spots. Clean it very well after this before installation.
10-21-2013, 03:58 PM
