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Piston Pin Inspection

  1. Measure diameter of piston pin. Zero dial indicator to piston pin diameter. Check piston for cracks or distortion. Measure piston pin bore in piston. Difference between the 2 measurements is pin-to-piston clearance.
  2. Ensure clearance is -0.0002 to +0.0001" (-0.005 to +0.002 mm). If clearance is greater than 0.0002" (0.005 mm), install an oversize piston pin and re-measure clearance.
  3. Measure difference between piston pin diameter and connecting rod's small end bore. Interference fit between piston pin and connecting rod should be 0.0002-0.0006" (0.005-0.015 mm).
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