Piston and Connecting Rod - Inspection

PISTONS





Inspect the pistons for damage and excessive wear. Check top of the piston, ring grooves, skirt and pin bore. Measure the piston skirt diameter. If the piston is out of limits, replace the piston.





The upper groove only needs to be inspected for damage. Use a new piston ring (2) to measure the clearance in the intermediate ring groove. Minimum clearance is 0.045 mm (0.0018 inch), maximum clearance is 0.095 mm (.0037 inch). If the clearance of the intermediate ring exceeds specifications, replace the piston (3).

Use a new oil ring to measure the clearance in the oil groove. Minimum clearance is 0.040 mm (0.0016 inch), maximum clearance is 0.085 mm (.0033 inch). If the clearance exceeds specifications, replace the piston.





Measure the pin bore (2). The maximum diameter is 40.012 mm (1.5753 inch), Minimum is 40.006 mm (1.575 inch). If the bore is over limits, replace the piston (1).





Inspect the piston pin for nicks, gouges and excessive wear. Measure the pin diameter (1). The minimum diameter is 39.990 mm (1.5744 inch), maximum 40.003 mm (1.5749 inch). If the diameter is out of limits, replace the pin (1).