Piston Ring, Engine

Piston Ring End Gap - Measured in Cylinder Bore
First Compression Ring
Production 0.23-0.44 mm (0.009-0.017 inch)
Service 0.23-0.5 mm (0.009-0.0196 inch)

Second Compression Ring
Production 0.44-0.7 mm 0.017-0.027 inch)
Service 0.44-0.76 mm (0.0173-0.03 inch)

Oil Control Ring
Production 0.18-0.75 mm (0.007-0.029 inch)
Service 0.18-0.81 mm (0.007-0.032 inch)

Piston Ring to Groove Clearance
First Compression Ring
Production 0.04-0.085 mm (0.00157-0.00335 inch)
Service 0.04-0.085 mm (0.00157-0.00335 inch)

Second Compression Ring
Production 0.04-0.078 mm (0.00157-0.0031 inch)
Service 0.04-0.078 mm (0.00157-0.0031 inch)

Oil Control Ring
Production 0.012-0.2 mm (0.0005-0.0078 inch)
Service 0.012-0.2 mm (0.0005-0.0078 inch)