A4 Quattro Sedan V6-2.8L (ACK) (1997)
Piston Ring: Service and Repair
Pistons
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 (3/8 inch) from bottom edge at right angle (90°) to piston pin.
Deviation from nominal size: 0.04 mm (0.0016 inch).
Piston and cylinder bore dimensions
Checking piston ring side clearance