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Fitting Pistons

  1. Take cylinder measurements 90° to crankshaft centerline and in line with crankshaft centerline as follows: 3/8" from top of bore, at middle of bore and 3/8" from bottom of bore. Difference between the corresponding measurements is out-of-round, and must not exceed 0.0016" (0.040 mm).
  2. Measure piston diameter 90° to piston pin bore, approximately 9/16" from bottom of piston skirt. Compare this measurement with measurement of corresponding cylinder bore. Maximum allowable piston-to-cylinder clearance is 0.0012" (0.030 mm) for a new piston, and 0.0028" (0.070 mm) for a used piston.
  3. Install oversize pistons if piston-to-cylinder clearance is excessive. Three sizes of oversize replacement pistons are available. A 4-digit number is marked on piston, denoting piston diameter.
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