Piston Ring: Specifications

Piston ring
Ring end gap
No.1 0.20 - 0.35 mm (0.0079 - 0.0138 inch)
Limit 0.8 mm (0.031 inch)
No.2 0.37 - 0.52 mm (0.0146 - 0.0205 inch)
Limit 0.8 mm (0.031 inch)
Oil ring side rail 0.2 - 0.7 mm (0.0079 - 0.0276 inch)
Limit 1.0 mm (0.039 inch)
Ring side clearance
No.1 0.04 - 0.08 mm (0.0016 - 0.0031 inch)
Limit 0.1 mm (0.004 inch)
No.2 0.03 - 0.07 mm (0.0012 - 0.0028 inch)
Limit 0.1 mm (0.004 inch)
Rings for service 0.25 mm (0.010 inch), 0.50 mm (0.020 inch)