Porsche 928 Workshop Manual page 1019

928 Differential/Transaxle System
39
DETERMINING THICKNESS OF SHIMS S, AND S2
The measured backlash must be brought to
the value specified by the drive pinion/ring
gear manufacturer by way of dividing "Stot".
The specified backlash is inscribed on the
rinq gear. Deviations of up to - 0.05 mm are
acceptable. The specified backlash must
never be exceeded.
Determining Shim Thickness
St (Ring Gear End)
St = Stot (total shim thickness)
measured backlash
+ specified backlash (inscribed on ring
gear)
Example:
stat
-measured backlash
+ specified backlash
(e.g. 0.20 mm)
Sl
0.95 mm
Q,8&mg.
0.07 mm
s!:amm
0.27 mm
Determining Shim Thickness
S2 (Opposite Ring Gear)
s2 = stat -s,
Example:
Stot
0.95 mm
Sl
.0.2Z.mm.
S2
:Q,%:am,,
Note
Experience with these drive pinions/ring
gears has shown that shims S2 (opposite
ring gear) can be selected approx. 10 to
15 % thinner in favour of shims S.,
(ring gear end).
1. Remove side transmission covers and
divide shims "Stot" to give the shim
thickness determined for St and S2.
Note
Make sure of a certain amount of backlash
when tightening nuts for the side
transmission covers. The drive pinion and
and ring gear must never be brought to
seize.
Printed in Germany X, 1984
Adjusting Drive Pinion
39 - 229
and Ring Gear