A6 Quattro Sedan V6-3.0L (AVK) (2002)
factory.
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For a new adjustment of the gear set, the drive pinion adjustment must now be performed with checks.
Adjusting backlash
(position of ring gear in transmission housing)
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Drive pinion installed with shim S3
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Differential installed with shims "S1*" and "S2*"
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Insert differential in final drive housing, install cover and tighten all bolts to 25 Nm.
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Turn differential 5 rotations in each direction to seat the tapered roller bearing.
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Install measuring tools.
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Use VW382/10 extension pin, 6 mm.
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Set VW388 measuring lever to dimension "a" = 60 mm.
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Determine backlash between teeth flanks as follows:
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Turn ring gear until it contacts a tooth flank (end of backlash travel).
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Set dial indicator to 0 with 1 mm preload.
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Turn ring gear back until it contacts opposite tooth flank (backlash).
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Read backlash and note.
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Turn ring gear 90° every time and repeat measurement 3 times.
Note: If measurements vary more than 0.06 mm from each other, ring gear or gear set is not installed correctly. Check installation, replace gear
set if necessary.
Determining average backlash
Example:
1. Measurement 0.28 mm
+ 2. Measurement 0.30 mm
- 3. Measurement 0.30 mm
+ 4. Measurement 0.28 mm
= Total of measurements 1.16 mm
^
Result: The average backlash is 1.16 mm / 4 = 0.29 mm
Determining thickness of shim "S2"
Formula:
"S2" = "S2*" - backlash + lift
Example:
Installed shim "S2*" 1.00 mm
Average backlash 0.29 mm
+ Lift (constant) 0.15 mm
= Thickness of shim "S2" 0.86 mm
^
Determine shim as closely as possible according to table.