Piston Ring, Engine

Piston Ring End Gap
First Compression Ring
Production 0.25 - 0.40 mm (0.010 - 0.016 inch)
Service 0.25 - 0.50 mm (0.010 - 0.020 inch)

Second Compression Ring
Production 0.38 - 0.58 mm (0.015 - 0.023 inch)
Service 0.38 - 0.80 mm (0.015 - 0.031 inch)

Oil Control Ring
Production 0.25 - 0.76 mm (0.010 - 0.029 inch)
Service 0.005 - 0.090 mm (0.0002 - 0.0035 inch)

Piston Ring to Groove Clearance
First Compression Ring
Production 0.030 - 0.070 mm (0.0012 - 0.0027 inch)
Service 0.030 - 0.085 mm (0.0012 - 0.0033 inch)

Second Compression Ring
Production 0.076 - 0.280 mm (0.0030 - 0.0110 inch)
Service 0.030 - 0.085 mm (0.0012 - 0.0033 inch)

Oil Control Ring
Production 0.06 - 0.196 mm (0.0018 - 0.0077 inch)
Service 0.076 - 0.200 mm (0.0030 - 0.0079 inch)