Piston Ring, Engine

Piston Ring Gap & Groove Clearance

Ring Gap:
Top Compression Ring 0.30 - 0.40 mm (0.0118 - 0.0157 in.)
Second Compression Ring 0.35 - 0.60 mm (0.0137 - 0.0236 in.)
Oil Control (Steel Rails) 0.20 - 0.71 mm (0.0079 - 0.028 in.)
Side Clearance:
Top Compression Ring 0.02 - 0.068 mm (0.0007 - 0.0026 in.)
Second Compression Ring 0.02 - 0.058 mm (0.0007 - 0.0022 in.)
Oil Ring (Steel Ring) 0.019 - 0.229 mm (0.0007 - 0.0091 in.)