A6 Sedan V6-3.2L (BKH) (2007)
Checking piston
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Measure approximately 10 mm from 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: 0.04 mm.
Nominal dimension see Piston and cylinder dimensions.
Checking cylinder bores
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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.
Installed position of piston and piston/cylinder allocation
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Mark installed position and allocation to cylinder on piston head using chalk or waterproof felt pen.
Note:
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Do not use a center punch or scribe, since the piston head coating will be damaged.
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Installed location: Arrow on piston face points toward belt pulley side.