Measuring Piston-Ring Vertical Clearance

Measure piston-ring vertical clearance.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Piston-ring vertical clearance
1. 1.1 Clean the ring groove on the piston.
2. 1.2 Fit piston ring on the ring groove of the piston. Piston-ring vertical clearance
3. 1.3 Guide a feeler gauge into the gap between the piston ring and ring groove and read off the value. Piston-ring vertical clearance

Piston ring	New in mm	Wear limit in mm
1. compression ring	0.06-0.09	0.2
2. compression ring	0.03-0.06	0.15
Oil scraper ring		Cannot be measured