A6 Quattro Wagon V6-2.8L (AFC) (1995)
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Take reading on dial indicator.
Example:
Reading on dial indicator = 1.45 mm
Determine Stotal (S3 + S4).
Stotal = Gauge reading + preload
Preload (design value-constant)
0.15 mm
+ Gauge reading (example)
1.45 mm
=Stotal
1.60 mm
Checking Preload Of Tapered Roller Bearings For Pinion And Hollow Shaft
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Using calculated total thickness (Stotal, 1.60 mm in example above) select shim from table (refer below) and install behind tapered roller bearing
outer race of transmission cover (S4 side).
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Install transmission cover.
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Rotate pinion and hollow shaft several times so that tapered roller bearings can settle.
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Install measuring fixture.
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Secure bolt (arrow) on transmission housing.
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Set dial indicator (3 mm range) to zero with 1 mm preload.
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Loosen bolts of transmission cover.
If shims have been selected correctly, dial indicator should now indicate a reading between 0.08 and 0.15 mm.
Measuring Friction Torque
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Leave calculated thickness of shim (1.60 mm in example) in place behind tapered roller bearing outer race in transmission cover (S4 side).
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Lubricate tapered roller bearings with gear oil.
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Install transmission cover again.
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Measure coefficient of friction of tapered roller bearings for pinion and hollow shaft.