Dimension & Clearance Specifications - Piston Rings

Compression Ring Groove Clearance:
Production Top 0.050-0.15 mm (0.02-0.06 inch)
Production 2nd 0.10-0.20 mm (0.04-0.08 inch)
Service Limit (Maximum) 0.050-0.107 mm (0.00196-0.00421 inch)

Piston Compression Ring Gap:
Production Top 0.25-0.40 mm (0.010-0.016 inch)
Production 2nd (Maximum) 0.46-0.66 mm (0.018-0.026 inch)
Service Limit (Maximum) 0.25-0.88 mm (0.06-0.035 inch)

Piston Oil Ring Groove Clearance:
Production 0.051-0.17 mm (0.002-0.007 inch)
Service Limit (Maximum) 0.051-0.20 mm (0.002-0.008 inch)

Piston Oil Ring Gap
Production 0.003-0.0127 mm (0.015-0.050 inch)
Service Limit (Maximum) 0.25-1.65 mm (0.009-0.065 inch)