Check piston wear
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- 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.
NOTE:
If the wear limit is exceeded, the piston must be replaced!
The maximum wear allowed on specified measuring point is 100 "MUE" m (= 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 !
NOTE:
- Original pistons from the Porsche spare parts catalogue are only available in the dimensional group X.
- Please observe different weight groups!
PISTON DIMENSIONS
| Dimensional group (in mm) | 3.4-I engine up to MY 01 | 3.6-I engine from MY 02 | Wear dimension in mm |
|---|---|---|---|
| I | 95.990 - 95.980 | 95.990 - 95.980 | max. 0.1 |
| X | 95.995 - 95.985 | 95.995 - 95.985 | max. 0.1 |
| II | 96.000 - 95.990 | 96.000 - 95.990 | max. 0.1 |