Piston Pin: Testing and Inspection

^ Tool Required:
- J 26900-1 Outside Micrometer, Or Equivalent

1. Connecting rod bore inside diameter using a telescoping micrometer. Record measurement. Standard connecting rod bore inside diameter is 19.003 to 19.011 mm (0.7482 to 0.7486 inch). If the connecting rod bore is out of specification, replace the connecting rod.
2. Piston pin diameter using an outside micrometer. Record measurement. Standard piston pin diameter is 18.995 to 19.000 mm (0.7479 to 0.7480 inch). If the piston pin diameter is out of specification, replace the piston pin.
3. Subtract piston pin diameter from connecting rod bore inside diameter to obtain piston pin clearance. Piston pin clearance specification is 0.003 to 0.016 (0.0001 to 0.0006 inch). If the piston pin clearance exceeds 0.05 mm (0.002 inch), replace the connecting rod and/or piston pin.
4. Inspect the piston pin it should fit into piston bore easily at normal room temperature.