Piston Rings
- Inspect the piston ring side clearance.
Using a feeler gauge, measure the clearance between new piston ring and the wall of ring groove.
If the clearance is greater than maximum, replace the piston.
Piston ring side clearance
[Standard]
No. 1 ring:
0.040 - 0.080 mm (0.00157 - 0.00315 in.)
No. 2 ring:
0.040 - 0.080 mm (0.00157 - 0.00315 in.)
Oil ring:
0.040 - 0.115 mm (0.00157 - 0.00453 in.)
If the clearance is greater than maximum, replace the piston.
- Inspect piston ring end gap.
To measure the piston ring end gap, insert a piston ring into the cylinder bore. Position the ring at right angles to the cylinder wall by gently pressing it down with a piston. Measure the gap with a feeler gauge.
Piston ring end gap
[Standard]
No. 1 ring: 0.15 - 0.30 mm (0.0059 - 0.0118 in.)
No. 2 ring: 0.30 - 0.45 mm (0.0118 - 0.0177 in.)
Oil ring: 0.20 - 0.50 mm (0.0079 - 0.0197 in.)
If the gap exceeds the service limit, replace the piston rings. If the gap is too large, recheck the cylinder bore inner diameter. If the bore is over the service limit, the cylinder block must be replaced.