911 Carrera S Cabriolet (997) F6-3.8L (2007)
Piston Ring: Specifications
Piston and ring specifications
Check the piston diameter -D- at the prescribed measuring point on the piston shank using an outside micrometer.
Measuring point from lower edge of shank dimension X = 15 mm.
Checking the piston shank diameter
The maximum wear allowed at the specified measuring point is 100 microns (= 0.1 mm). If this measurement is exceeded, the piston must be
replaced. The reference measurements are listed in the table below.
Piston rings and piston ring groove:
Piston rings:
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Check piston rings for signs of wear.
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Piston-ring end clearance is measured in the cylinder.