Piston Ring, Engine

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

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

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

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

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

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