Audi Workshop Service and Repair Manuals

General notes:

• ◆ Careful setting of drive pinion and crown wheel is essential to long service life and smooth running of final drive. Drive pinion and crown wheel are checked at the production stage for proper contact pattern and low noise in both directions of rotation. The position providing the smoothest running is established by axially shifting the drive pinion, with the crown wheel being constantly kept out of no-play meshing to the extent required to ensure that the backlash is within the specified tolerance.
• ◆ The aim of the adjustment process is to re-attain the position providing the smoothest running as determined on the test machine in the production phase.
• ◆ The deviation "r" referenced to the master gauge "Ro" is measured for the replacement pinion sets and marked on the outer periphery of the crown wheel. Pinion sets (= drive pinion and crown wheel) are only to be replaced as a complete assembly.
• ◆ Pay attention to the general repair instructions for taper roller bearings and shims.
• ◆ Friction torque measurement is intended only as a final check of the adjustment.