A6 Quattro Sedan V6-2.8L (AHA) (1998)
Pinion Gear: Adjustments
5 Speed Manual 01A
Notes:
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Careful adjustment of the drive pinion and ring gear is important for the service life and smooth running of the final drive. For this reason, the
drive pinion and ring gear are matched together during manufacture, and checked to ensure a good mesh pattern 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 ring gear out of
the zero-play mesh position by the amount necessary to maintain the backlash within the specified tolerance.
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The object of the adjustment is to reproduce the setting for quietest possible running, as obtained on the test machine in production.
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The deviation, or tolerance "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 ring gear. The final drive set (drive pinion and ring gear) may only be replaced together as a matched
pair.
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Observe the general repair instructions for taper roller bearings and shims.
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Maximum care and cleanliness are essential for achieving good results when performing repairs and taking measurements.
Gear sets, adjusting and marking
1. Identification - "0937" signifies an Oerlikon gear set with a ratio of 37:9
2. Gear set pairing number (312)
3. Deviation (tolerance) "r" is based on the test machine master gauge used in the production. The deviation "r" is always given in 1/100 mm.
Example: "25" signifies r = 0.25 mm
Ro - Length of master gauge used for test machine "Ro"
Ro - Ring gear = 57.50 mm
R - Actual dimension between center axis of ring gear and face of pinion at point with quietest running for this gear set.
R= Ro or
Vo - Hypoid offset
Readjusting final drive set, recommended sequence
The following work sequence is recommended to save time when the drive pinion and ring gear have to be adjusted: