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Fitting Pistons

  1. Using telescopic gauge and micrometer, measure cylinder bore diameter at a point 2 1/2" from top of bore. Measure piston diameter across piston skirt, at centerline of piston pin. Difference between two measurements is piston-to-cylinder bore clearance.
  2. Using cylinder bore gauge, measure cylinder bore taper by working gauge up and down in bore. Taper must not exceed .001" (.03 mm). To determine out-of-round, take measurements at different points in bore, by rotating bore gauge horizontally, around entire circumference of bore. Out-of-round must not exceed .002" (.05 mm).
  3. If taper or out-of-round are not within limits, hone or bore cylinders for installation of new pistons.
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