Piston Ring, Engine

Piston Ring Groove Clearance
1st Ring
Standard 0.04 - 0.08 mm ( 0.0015 - 0.0031 in.)
Limit 0.12 mm (0.0047 in.)
2nd ring
Standard 0.03 - 0.07 mm (0.0012 - 0.0028 in.)
Limit 0.10 mm (0.0039 in.)
Oil ring
Standard 0.04 - 0.12 mm (0.0016 - 0.0047 in.)
Limit --

Piston ring end gap
Top ring
Standard 0.20 - 0.32 mm (0.0079 - 0.0126 in.)
Limit 0.7 mm (0.0276 in.)
2nd ring
Standard 0.33 - 0.45 mm (0.0130 - 0.0177 in.)
Limit 1.0 mm (0.0394 in.)
Oil ring
Standard 0.10 - 0.50 mm (0.0039 - 0.0197 in.)
Limit 1.2 mm (0.0472 in.)