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)