Pinion Shaft Position Adjustment - Porsche 2015 911 GT3 Cup Technical Manual

2.9.6

Pinion shaft position adjustment

Powertrain
Adjustment is done in two steps. In the first step, the distance between the top of the
bevel gear and the projection of the gearbox housing opening (blue arrow) is
determined. This is the measurement that the pinion shaft must ultimately be set to.
The actual distance between gearbox housing opening and the top of the bevel gear
is measured in the second step. The difference between the two measurements is
adjusting measurement P1.
Adjusting disk P1 is used to precisely adjust the position of the bevel gear in relation
to the ring gear. There is a manufacturing dimension (2), e.g. 75.002, measured by
the manufacturer on the gearbox housing. This measurement is the distance between
the gearbox housing opening and the shift module axis (red dotted line). The
measurement from the bevel gear top to the shift module axis (red dotted line) is
always 43 mm (no tolerance) which also enters into the calculation. Measurement
requires a magnetic disc (thickness = 5mm) and a measuring plate (thickness =
20mm); the resulting thickness of 15 mm also enters into the calculation. (Measuring
plate 20mm – magnetic disc 5 mm = 15 mm).
2.9.6.1
Calculation process
Calculation example: 75.002 + 15 + 43 = 133.002 mm. This calculated
measurement of the installation position of the pinion shaft must now be compared
with the actual measured distance and then adjusted accordingly.
2.9.6.2
911 GT3 Cup (991)
Version: 16.12.2014
96
MY 2015