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Piston Pin: Notes

NOTE: Do not reuse the old piston pin.
  1. Use a micrometer to measure the new piston pin outside diameter in both directions at three different positions.
  2. Measure the inside diameter of the connecting rod small end. If the fitting interference between the small end and pin does not conform to the specified value, the connecting rod must be replaced.

    Standard:  0.023 mm-0.038 mm (0.0009 in-0.0015 in)

    Fig 1: Measuring Piston Pin Outside Diameter
    G03323976Courtesy of ISUZU MOTOR CO.
  3. Insert the new pin into the piston and rotate it. If the pin rotates smoothly with no backlash, the clearance is normal. If there is backlash or roughness, measure the clearance. If the clearance exceeds the specified limit, the piston must be replaced.

    Clearance 

    Standard:  0.010 mm-0.017 mm (0.0004 in-0.0007 in)

    Limit:  0.040 mm (0.0016 in)

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