A8 Quattro Sedan V8-4.2L (BVJ) (2008)
Compressor Pulley: Adjustments
Drive Plate with Overload Protection, Checking Run-Out and Adjusting
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Remove compressor. Refer to => [ Compressor, S8 10 Cylinder ] See: Service and Repair.
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Clean flange at drive plate - A -
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Secure a dial gauge - B - using a dial gauge holder - C - using Dial Gauge Holder (Vw 387)on compressor.
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Set probe of dial gauge - D - on flange of drive plate - A - with a pre-tension of approximately 1.0 mm.
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Turn compressor drive unit - E - several rotations.
Specification: Run-out deviation is less than 0.21 mm run-out of dial indicator, difference between smallest and largest measured value 0.2 mm
maximum
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If run-out deviation is greater than 0.2 mm, loosen bolts on drive plate. Refer to => [ Drive Plate with Overload Protection ] See: Service and
Repair/Drive Plate With Overload Protection and re-adjust drive plate.