Piston Ring Groove Clearance

1. Measure piston compression ring groove clearance by fitting a new piston ring into the piston groove and measuring the clearance between the ring and ring land using an appropriate feeler gage. Before measurement can be made, the piston grooves must be clean, dry and free of carbon.
2. Measure piston upper compression ring groove clearance specification: 0.045-0.085 mm (0.0018 to 0.0033 inch).
3. Measure piston lower compression ring groove clearance specification: 0.030 to 0.070 mm (0.0012 to 0.0028 inch).

CAUTION: If ring groove clearance is not within specification, the piston ring must be replaced.