A6 Quattro Sedan V6-2.8L (AHA) (1998)
Piston: Service and Repair
Pistons
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Installation position: arrow on piston crown must point in driving direction
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Mark cylinder number on piston crown using waterproof felt pen.
CAUTION: DO NOT scratch or scribe on piston crown. The surface has a coating that must not be damaged.
Checking piston diameter
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Measure pistons approximately 10 mm (0.39 inch) from bottom of skirt, at right angle (90°) to piston pin.
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Maximum difference between actual and nominal diameter: 0.04 mm (0.0016 inch)
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For piston ring clearance and end gap.
Checking piston ring clearance