A6 Quattro Sedan V8-4.2L (BVJ) (2007)
Checking piston
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Measure approximately 15 mm from the lower edge, at a 90° angle to piston pin axis using an external micrometer 75 to 100 mm.
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Maximum deviation from nominal dimension: 0.03 mm.
Nominal dimension see Piston and cylinder dimensions.
Measuring cylinder bore
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Using an internal dial gauge 50 to 100 mm, measure at 3 points in diagonal sequence horizontally - A - and vertically - B -.
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Maximum deviation from nominal dimension: 0.08 mm.
Nominal dimension see Piston and cylinder dimensions.
Piston installation position
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Mark allocation to cylinder with pen on piston crown for reinstallation.
Note:
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Do not use a center punch or scribe, since the piston head coating will be damaged.
Installed location:
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Arrows on piston heads point to belt pulley side.
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Large valve recesses - 1 - point toward center of engine.
