Checking Piston-Ring Vertical Clearance

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Clean ring groove on piston before checking clearance.

Fig 1: Checking Piston-Ring Vertical Clearance
Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Piston Ring	New mm	Wear Limit mm
1st Compression Ring	0.04... 0.08	0.20
2nd Compression Ring	0.03... 0.07	0.20
Oil Scraper Ring	0.02... 0.06	0.15