Measuring Piston-Ring Vertical 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.

Measure piston-ring vertical clearance.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Piston-ring vertical clearance

1.1 Clean the ring groove on the piston.
1.2 Fit piston ring on the ring groove of the piston > Piston-ring vertical clearance
1.3 Guide a feeler gauge into the gap between the piston ring and ring groove and determine the value > Piston-ring vertical clearance

Piston ring	New in mm	Wear limit in mm
1st compression ring	0.03-0.07	0.15
2nd compression ring	0.02-0.07	0.15
Oil scraper ring	Cannot be measured	-