Audi Workshop Service and Repair Manuals

General notes:

• ◆ Careful adjustment of the drive pinion and crown wheel is important for the service life and smooth running of the final drive. For this reason, the drive pinion and crown wheel are matched together during manufacture, and checked to ensure a good mesh pattern and quiet running in both directions of rotation. The position of quietest running is found by moving the drive pinion in an axial direction and at the same time lifting the crown wheel out of the zero-play mesh position by the amount necessary to maintain the backlash within the specified tolerance.
• ◆ The object of the adjustment is to reproduce the setting for quietest possible running, as obtained on the test machine in production.
• ◆ The deviation "r", which is related to the master gauge "Ro" is measured for the final drive sets supplied as replacement parts and marked on the outer circumference of the crown wheel. The final drive set (drive pinion and crown wheel) must only be replaced together as a matched pair.
• ◆ Observe the general repair instructions for taper roller bearings and shims.
• ◆ Maximum care and cleanliness are essential for achieving good results when performing repairs and taking measurements.