Porsche 911 Carrera Technical Manual page 184

911 Carrera (996)
Final drive -Differential, differential lock
Setting circumferential backlash
7. Fit the universal dial gauge holder with flat
extension so that a right angle is produced
between the dial gauge axis and the lever.
Note
The backlash to be set is inscribed on the edge
of the crown wheel.
1. Fit the gear set with the adjusting shims
determined during adjustment of the pinion
shaft.
:~=-;:J.
Note
Always tighten the collar nut of the drive pinion
to 300 Nm (222 ftlb.) before carrying out the
measurement.
VW382/10
VW 387
2. Fit the differential with tapered roller bearings
and the determined spacer rings (51 + 52)
into the housing.
~
Dimension "a" = 91 mm
366_99
3. Put on the side transmission cover and tighten
all hexagon-head bolts to 25 Nm (19 ftlb).
8. Carefully turn the crown wheel as far as it will
go via the clamping screw of the adjustment
device and set the dial gauge to zero. Next,
turn the crown wheel back and read off the
circumferential backlash. Note the value.
Note
Always make sure a certain amount of backlash
is present when tightening the screws. The drive
pinion must not jam under any circumstances.
4. Screw measuring lever VW 388 together with
the adjusting device VW 521/4 and set the
lever length to 91 mm using the gauge
plunger. See dimension "a" in the illustration.
5. Insert the adjusting device with clamping
sleeve (special tool 9145) into the differential
and clamp it securely.
6. Turn the differential several times in both
directions so that the tapered roller bearings
can settle.
39 -229
3908 15 Adjusting drive set -GT3
Printed in Germany -29, 1999
GT339227