Piston Ring, Engine

PISTON RING SIDE CLEARANCE





^ Measure side clearance of piston ring and piston ring groove with feeler gauge.
Standard
Top ring: 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
2nd ring: 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Oil ring: 0.065 - 0.135 mm (0.0026 - 0.0053 inch)
Limit Top ring: 0.11 mm (0.0043 inch)
2nd ring: 0.10 mm (0.004 inch)
Oil ring: -
^ If out of specification, replace piston and/or piston ring assembly.

PISTON RING END GAP





^ Check if inner diameter of cylinder bore is within specification.
Refer to PISTON TO CYLINDER BORE CLEARANCE.
^ Insert piston ring until middle of cylinder with piston, and mea sure gap.
Standard
Top ring: 0.21 - 0.31 mm (0.0083 - 0.0122 inch)
2nd ring: 0.32 - 0.47 mm (0.0126 - 0.0185 inch)
Oil ring: 0.20 - 0.60 mm (0.0079 - 0.0236 inch)
Limit
Top ring: 0.54 mm (0.0213 inch)
2nd ring: 0.67 mm (0.0264 inch)
Oil ring: 0.95 mm (0.0374 inch)
^ If out of specification, replace piston ring. If gap still exceeds the limit even with a new ring, re-bore cylinder and use oversized piston and piston ring.