Porsche 928 Workshop Manual page 1219

39
Differential/Transaxle System
928
Recommended Sequence for Adjustment
of Pinion/Ring Gear
If drive pinion and ring gear have to be adjusted, the following sequence of procedures
would be most economical.
1. Determine total shim thickness "Sges" (S, plus S2) for specified preload of tapered roller
bearing/differential.
2. Determine shim thickness "Ss".
3. Divide total shim thickness "Sges"
into S, and Sz, so that specified backlash is between
ring gear and drive pinion.
Objective of adjustments must be to regain the maximum degree of quiet running, as had
been determined by the special testing machine in manufacturing.
Absolute cleanliness is essential for all assembly jobs and testing procedures to guarantee
perfect results.
After working on the final drive it will be necessary to adjust the pinion and ring gear,
if parts had been replaced which have direct influence on said adjustment. The following
chart will help in avoiding unnecessary adjustments!
Ring Gear Drive Pinion Deviation "r
6, + Sz)
63)
Transm. case (automatic) or
I x
X
rear transmission case
Bearing assembly for pinion X X
Final drive case
X X
Side transmission cover X
X
Pinion/ring gear
X X
Differential case
X
Tapered roller bearing for differential
X
-,1
0
39-126
Adjusting Drive Pinion and Ring Gear
Printed in Germany