Checking Piston Wear
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 Porsche 911, 2012 Porsche 911, 2011 Porsche 911, 2010 Porsche 911, and 2009 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
Information
The pistons in the M97.70 and M97.70S engine are only available in one dimensional group and two weight groups.
WARNING:
Caustic fluids
- Danger of chemical burns
→ Avoid contact with caustic fluid.
→ Wear personal protective gear.
→ Ensure that there is good ventilation.
→ If you do come into contact, wash off immediately with plenty of warm water and contact a doctor if necessary.
- Clean removed pistons with solvent naphtha.
- 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 X = 15 mm .
Information
- If the wear limit is exceeded, the piston and cylinder sleeve must be replaced.
The maximum wear allowed at the specified measuring point is 100 μm (= 0.1 mm). If this measurement is exceeded, the piston must be replaced. The reference measurements are listed in the table below.
PISTON SPECIFICATION (DIMENSIONAL GROUP)
| Dimensional group (in mm) | M97.70 + 70S engine | Tolerance | Wear in mm |
|---|---|---|---|
| I | 99.970 | ± 0.007 | max. 0.1 |
PISTON SPECIFICATION (WEIGHT GROUPS)
| Weight group | Piston, complete, 997 Turbo - Ø 100 mm |
|---|---|
| - | 564 - 570 g |
| + | 570 - 576 g |