Piston Ring, Engine

Piston Rings- End Gap Measured in Cylinder Bore
Compression Ring Gap
Production-Top Groove 0.25 - 0.40 mm (0.010 - 0.016 inch)
Production-2nd Groove 0.38 - 0.58 mm (0.015 - 0.023 inch)
Service-Top Groove 0.25 - 0.50 mm (0.010 - 0.020 inch)
Service-2nd Groove 0.38 - 0.80 mm (0.015 - 0.031 inch)
Compression Ring Groove Clearance
Production-Top 0.030 - 0.070 mm (0.0012 - 0.0027 inch)
Production 2nd Groove 0.040 - 0.080 mm (0 0015 - 0.0031 inch)
Service 0.030 - 0.085 mm (0.0012 - 0.0033 inch)
Oil Ring Gap
Production 0.25 - 0.76 mm (0.010 - 0.029 inch)
Service 0.005 - 0.090 mm (0.0002 - 0.0035 inch)
Oil Ring Groove Clearance
Production 0.046 - 0.196 mm (0.0018 - 0.0077 inch)
Service 0.046 - 0.200 mm (0.0018 - 0.0079 inch)