Piston Ring, Engine

Piston ring
Side clearance
No. 1 ring
Specifications 0.04 - 0.08 mm (0.0016 - 0.0031 in.)
Limit 0.1 mm (0.0039 in.)
No. 2 ring
Specifications 0.03 - 0.07 mm (0.0012 - 0.0027 in.)
Limit 0.1 mm (0.0039 in.)
Oil ring
Specifications 0.06 - 0.15 mm (0.0024 - 0.0059 in.)
Limit 0.2 mm (0.0079 in.)
End gap
No. 1 ring
Specifications 0.15 - 0.30 mm (0.0059 - 0.0118 in.)
Limit 0.6 mm (0.0236 in.)
No. 2 ring
Specifications 0.30 - 0.45 mm (0.0118 - 0.0177 in.)
Limit 0.7 mm (0.0275 in.)
Oil ring
Specifications 0.20 - 0.70 mm (0.0078 - 0.0275 in.)
Limit 0.8 mm (0.0315 in.)
Piston ring O.S.
Specifications 0.25 mm (0.0098 in.)
Specifications 0.50 mm (0.0197 in.)