Checking Pistons

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Using a Micrometer Nr. 135 Pos. 4 , measure approx. 10 mm from the lower edge, perpendicular to the piston pin axis.
Maximum deviation from nominal size: 0.03 mm .

Fig 1: Checking Pistons
Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Grinding Size	Piston Diameter mm	Cylinder Bore mm
Basic Size	84.49	84.51