Dimension & Clearance Specifications - Piston Rings

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