Measuring Piston-Ring End Clearance
WARNING: This page is about a different car, the 2020 Porsche Panamera, 2019 Porsche Panamera, 2018 Porsche Panamera, and 2017 Porsche Panamera. However, it is still accessible from the selected car via links, so may be relevant.
- Insert piston ring into the cylinder from the top to about 15 mm from the lower edge of the cylinder at a right angle to the cylinder wall.
Use a piston with no piston rings to slide it in.
- Measure piston-ring end clearance.
 Courtesy of PORSCHE CARS NORTH AMERICA, INC.
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Piston-ring end clearance
- 2.1 Guide a feeler gauge into the gap on the piston ring and determine the value > Piston-ring end clearance
| Piston ring |
New in mm |
Wear limit |
| 1st compression ring |
0.15-0.25 |
0.35 |
| 2nd compression ring |
0.30-0.45 |
0.55 |
| Oil scraper ring |
Cannot be measured |
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