Checking Piston Wear
WM 131001 Check piston wear1. Clean removed pistons with solvent naphtha. For detecting the dimensional group (nailed onto piston crown), carbon deposits must be removed carefully, e.g. with a brass brush.
2. Check piston diameter -D- on oil piston shank with micrometer gauge. Measured from the lower edge of the shank, the height -X- on the shank is 16 mm.
Information
^ If the wear limit is exceeded, the piston must be replaced!
The maximum wear allowed on specified measuring point is 100 microns (= 0.1 mm). If this measurement is exceeded, the piston must be replaced. The reference measurements for the piston dimensional groups are to be taken from the following table!
Information
^ Original pistons from the Porsche spare parts catalogue are only available in the dimensional group X.
^ Please observe different weight groups!
