Piston Ring, Engine

Piston Ring Compression
Top Groove Clearance 0.031-0.074 mm (0.0012-0.0029 inch)
Second Groove Clearance 0.031-0.074 mm (0.0012-0.0029 inch)
Top Ring Production Gap 0.300-0.450 mm (0.012-0.018 inch)
Top Ring Service Limit Gap 0.450-0.675 mm (0.018-0.027 inch)
Second Ring Production Gap 0.450-0.650 mm (0.017-0.025 inch)
Second Ring Service Limit Gap 0.675-0.975 mm (0.026-0.039 inch)

Piston Ring Oil Control
Ring Groove Clearance 0.051-0.203 mm (0.002-0.008 inch)
Production Gap 0.249-0.759 mm (0.0098-0.0299 inch)
Service Limit Gap 0.373-1.138 mm (0.015-0.045 inch)