S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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Clean ring groove of piston before checking.
Checking piston
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Measure approx. 10 mm from the lower edge, at a 90 degrees 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.
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.