Crownwheel and Pinion Backlash Setting
Following setting the Differential Bearing Preload it is neccesary to set the correct backlash for the Crownwheel and Pinion. To do this proceed as follows.
1. Fit the differential to the gearbox and fit the left hand sideplate, fasten securely ensuring that the differential is free to turn whilst tightening the nuts.
2. When all of the nuts are fastened fit the front hub and the two reamost hubs to the pinion shaft, fit a spacer, ERT-TO-005, to the shaft and tighten up the pinion shaft nut.
3. It is now possible to fit a Dial Test Indicator (DTI) to the rearmost maincase studs and fit the pointer onto the rear most hub spline. By rotating the pinion shaft gently by hand the backlash can be measured.
4. The amount of backlash required is 0.1 to 0.15mm, If you have this on your first try then Congratulations, If not, Read on...
5. Adjustment is made to the backlash by moving the diff preload shims from one sideplate to the other, at this point no shims should be added/removed or this will alter the Differential Preload. To increase the backlash shims should be moved from the left to the right and vice versa to decrease the backlash.
6. Measurements should be taken at various positions around the pinion shaft to average out the effects of any manufacturing tolerances.
7. If you still have the dummy bearing cones fitted replace them now with correct parts and install the differential and sideplate.