Porsche 911 Carrera Technical Manual page 183

Final drive -Differential, differential lock 911 Carrera (996)
5.00 mm
0.75 mm
0.40 mm
6.15 mm
Example:
Calculated ring thicknesses
S1 + S2 = 2.375 + 3.775 = 6.15 mm
Example
Shim thickness used
Measurement result
Compression (constant value)
"S tot,"
Rounded ring thicknesses
10. Remove the differential, pull off both tapered
roller bearings and distribute the calculated
shim thickness "S tot." as described below.
As a starting point for later adjustment of the
backlash, spacer ring SI is selected 0.70
mm thinner and spacer ring S2 0.70 mm
thicker.
Sl + S2= 2.375 + 3.775 = 6.15 mm
Measure the adjusting shims at several points
with a micrometer. Permissible size deviation:
0.02 mm. Also check shims for burrs and signs
of damage.
Example
Total disc thickness of spacer rings
$1 + $2 = 6.15 mm
Thickness of spacer ring Sl
6.15 mm
')
3.075 mm
-0.700 mm
2.375 mm
=
Thickness of spacer ring S2
6.15 mm
2
3.075 mm
+ 0.700 mm
3.775 mm
=
Note
The spacer rings are available in thicknesses
from 1.5 to 2.8 mm in increments of 0.05 mm.
The calculated ring thicknesses must be
rounded up or down to the dimensions to be
used so that the total disc thicknesses 51 and
52 are not changed.
Adjusting drive set -GT3
Printed in Germany -29, 1999
39 08 15
39 -228
GT339227