Dimension & Clearance Specifications - Piston Rings

Piston Ring Compression
Top Groove Production Clearance 0.031-0.074 mm (0.0012-0.0029 inch)
Second Groove Production Clearance 0.031-0.074 mm (0.0012-0.0029 inch)
Service Limit Groove Clearance 0.0991-0.305 mm (0.0012-0.0039 inch)
Top Ring Production Gap 0.254-0.457 mm (0.010-0.018 inch)
Top Ring Service Limit Gap 0.254-0.711 mm (0.010-0.028 inch)
Second Ring Production Gap 0.406-0.609 mm (0.016-0.024 inch)
Second Ring Service Limit Gap 0.406-0.863 mm (0.016-0.034 inch)
Piston Ring Oil Control
Production Groove Clearance 0.127-0.165 mm (0.0050-0.0065 inch)
Service Limit Groove Clearance 0.127-0.191 mm (0.0050-0.0075 inch)
Production Gap 0.254-0.762 mm (0.010-0.030 inch)
Service Limit Gap 0.254-1.016 mm (0.010-0.040 inch)