Measuring

BEFORE MEASURING





Note the following when measuring the pinion setting:

Car with manual gearbox: The gearbox output shaft bearings should be preloaded so that the torque necessary to rotate the pinion is 2.5 +/- 0.5 Nm (1.85 +/- 0.4 lb ft). This applies to new, lightly oiled bearings. The corresponding figures for older bearings (in service more than 2,000 km or 1,200 miles) are 1.3 +/- 0.5 Nm (0.96 +/- 0.4 lb ft).
The differential should be removed to allow the measuring tool to be fitted. Measuring tool 83 90 155 consists of a jig to which a dial indicator is secured. A slip gauge is available for adjusting the dial indicator, and this should be placed against the calibration pads of the jig. The distance between these pads and the centerline of the crown wheel is alwasy 60.000 mm (2.362 in) (see figure). The procedure for measuring the pinion setting is as follows:

TO MEASURE





1. Check that the pointers of the dial indicator are zeroed when the indicator tip rests on the slip gauge.
2. Place the measuring tool in the differential housing bearing seats, with the dial indicator tip resting on the ground end of the pinion, and take a reading.





3. If the pinion is correctly set, the dial indicator reading in hundredths of a millimeter (+ or -) should be as stamped on the pinion. The permissible tolerance is +/- 0.05 mm (0.002 in).