Piston Ring Gap and Groove Clearances

Piston Ring:
Side Clearance:
No.1 and No.2:
Specification 0.03 - 0.07 mm (0.0012 - 0.0028 inch)
Limit 0.1 mm (0.004 inch)
End Gap:
No.1:
Specification 0.25 - 0.45 mm (0.0098 - 0.0177 inch)
Limit 0.8 mm (0.031 inch)
No.2:
Specification 0.35 - 0.50 mm (0.0138 - 0.0197 inch)
Limit 0.8 mm (0.031 inch)
Oil Ring Side Rail:
Specification 0.20 - 0.70 mm (0.0079 - 0.0276 inch)
Limit 1.0 mm (0.040 inch)
Service Size:
Specification 0.25, 0.50, 0.75, 1.00 mm (0.010, 0.020, 0.030, 0.039 inch) Oversize