Piston Pins

REMOVAL





1. Apply engine oil to the piston pin snap rings, and turn them in the ring grooves until the end gaps are lined up with the cutouts in the piston pin bores.

NOTE: Take care not to damage the ring grooves.





2. Remove both snap rings. Start at the cutout in the piston pin bore.

NOTE: Remove the snap rings carefully so they do not go flying or get lost. Wear eye protection.





3. Heat the piston and connecting rod assembly to approximately 70°C (158°F), then remove the piston pin.

WARNING: Work carefully to prevent getting burned.

INSPECTION





NOTE: Inspect the piston, piston pin and connecting rod when they are at room temperature.

1. Measure the diameter of the piston pin

Piston Pin Diameter:
Standard (New): 21.961 - 21.965 mm (0.8646 - 0.8648 inch)
Service Limit: 21.953 mm (0.8643 inch)





2. Zero the dial indicator to the piston pin diameter.





3. Check the difference between the piston pin diameter and piston pin hole diameter on the piston.

NOTE: Check the piston for distortion or cracks.

Piston Pin to Piston Clearance:
Standard (New): -0.003 to +0.006 mm (-0.0001 to +0.0002 inch)
Service Limit: 0.009 mm (0.0003 inch)





4. Measure the piston pin-to-connecting rod clearance.

Piston Pin to Connecting Rod Clearance:
Standard (New): 0.005 - 0.015 mm (0.0002 - 0.0006 inch)
Service Limit: 0.002 mm (0.0008 inch)

INSTALLATION





1. Install a piston pin snap ring.





2. Heat the piston to approximately 158°F (70°C).

WARNING: Work carefully to prevent getting burned.





3. Coat the piston pin bore in the piston, the bore in the connecting rod, and the piston pin with engine oil. Install the piston pin.
4. Install the remaining snap ring.