Piston Ring, Engine

PISTON RING SIDE CLEARANCE





^ Measure side clearance of piston ring and piston ring groove with feeler gauge.
Standard 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)
Maximum Limit
Top ring 0.11 mm (0.0043 inch)
2nd ring 0.1 mm (0.004 inch)
Oil ring -
^ If out of specification, replace piston ring assembly. If clearance exceeds maximum limit with new rings, replace piston

PISTON RING END GAP





^ Insert piston ring until it is in the middle of the cylinder bore and measure the end gap.
Standard
Top ring 0.23 - 0.33 mm (0.0091 - 0.0130 inch)
2nd ring 0.33 - 0.48 mm (0.0130 - 0.0189 inch)
Oil ring 0.20 - 0.50 mm (0.0079 - 0.0197 inch)
Limit:
Top ring 0.54 mm (0.0213 inch)
2nd ring 0.80 mm (0.0315 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.





Piston Ring