To Adjust the Differential Bearings

MEASURING AND SHIMMING
To Adjust The Differential Bearings.

NOTE: Adjustment must be carried out before the out-put shaft is fitted. (If only the final drive has been dismantled for replacement of the differential bearings, the crown wheel must also be removed when the preloading of the bearings is adjusted.)





1. Place the differential in the gearcase.
2. Fit the left-hand bearing housing (with speedometer drive) without shims, and tighten the bolts to the specified torque.
Tightening torque for the left-hand bearing housing:
^ 23 - 28 Nm (17 - 21 lb ft.)
3. Oil the differential bearings and fit the right-hand bearing housing. Tighten the bolts in two or three stages. Rotate the differential while tightening the bolts.
Tightening torque for the right-hand bearing housing:
^ 2.2 Nm (1.6 lb ft.)





4. Use feeler gauges to measure the clearance between the gearcase and the bearing housing at two points opposite one another and calculate the mean value. Then select shims corresponding to the calculated dimension, but add 0.20 mm (0.008 in.) to ensure correct preloading of the bearings.

NOTE: The method described above applies to both new and old bearings.





The result of this preloading can be measured by means of a torque spanner and driver 87 90 818.

Adjust to the correct value. The rolling resistance values are tabulated below:

NOTE: New, lightly oiled bearings: 1.8 - 2.8 Nm (1.33 - 2.07 lb ft). Bearings that have been in service more than 2000km: 0.8 - 1.3 Nm (0.59 - 0.95 lb ft.)

Suitable combinations of four different shim thicknesses can be used for shimming. The available shims thicknesses are tabulated below.

NOTE: The set of shims should be distributed onto the right-hand and left-hand sides to obtain the correct backlash.





Shim Table

To Adjust the Crown Backlash
1. Place the differential with crown wheel in the gearcase.
2. Fit the left-hand bearing housing (with speedometer drive) without shims and the right-hand bearing with the set of shims selected earlier. Tighten the bolts to the specified torque.
Tightening torque for the left-hand and right-hand bearing housings:
^ 23-28 Nm (17-21 lb ft.)





3. Set up the dial indicator as shown in the figure and measure the backlash.
4. Calculate the difference between the measured and calculated backlash, and then move a suitable thickness of shims to the left-hand bearing housing. Then check the backlash again.

NOTE: When adjusting the backlash, use the set of shims selected earlier. The total thickness of shims must not be altered.