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Piston Pin Inspection

  1. Check piston for cracks or distortion. Measure diameter of piston pin. 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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