Piston and Connecting Rod Inspection
CLEANINGPISTONS
Clean the pistons and pins in a suitable solvent, rinse in hot water and blow dry with compressed air. Soaking the pistons over night will loosen most of the carbon build up. De-carbon the ring grooves with a broken piston ring and again clean the pistons in solvent. Rinse in hot water and blow dry with compressed air.
CONNECTING RODS
Clean the connecting rods in a suitable solvent, rinse in hot water and blow dry with compressed air.
INSPECTION
PISTONS
Piston Skirt Diameter:
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.
Intermediate And Oil Ring Clearances:
Uses new piston rings to measure the ring side clearance. Refer to the illustration and chart for specifications.
Piston Pin Bore:
Piston Pin Diameter:
Measure the pin bore. The maximum diameter is 40.025 mm (1.5758 inch). If the bore is over limits, replace the piston.
Inspect the piston pin for nicks, gouges and excessive wear. Measure the pin diameter. The minimum diameter is 39.990 mm (1.5744 inch). If the diameter is out of limits, replace the pin.
CONNECTING RODS
Inspect the connecting rod for damage and wear. The I-Beam section of the connecting rod cannot have dents or other damage. Damage to this part can cause stress risers which will progress to breakage.
Connecting Rod Pin Bore:
Measure the connecting rod pin bore. The maximum diameter is 40.042 mm (1.5764 inch). If out of limits replace the connecting rod.