Piston Ring, Engine

PISTON RING SIDE CLEARANCE





Side clearance
Top ring: 0.045 - 0.080 mm (0.0018 - 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: 0.2 mm (0.008 inch)
If out of specification, replace piston and/or piston ring assembly.

PISTON RING END GAP





End gap
Top ring: 0.20 - 0.39 mm (0.0079 - 0.0154 inch)
2nd ring: 0.32 - 0.56 mm (0.0126 - 0.0220 inch)
Oil ring: 0.20 - 0.69 mm (0.0079 - 0.0272 inch)
Limit of end gap
Top ring: 0.49 mm (0.0193 inch)
2nd ring: 0.64 mm (0.0252 inch)
Oil ring: 1.09 mm (0.0429 inch)
^ If out of specification, replace piston ring. If gap exceeds maximum limit with a new ring, rebore cylinder and use oversized piston and piston rings. Refer to Piston, Piston Ring and Piston Pin.
^ When replacing the piston, check the cylinder block surface for scratches or seizure. If scratches or seizure is found, hone or replace the cylinder block.