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Fitting Pistons

NOTE: Make all measurements with piston and block at normal room temperature (70°F, 21°C).
  1. Measure piston skirt 90° to piston pin axis. Measure cylinder bore 90° to crankshaft centerline, at top, middle, and bottom of bore. Use these measurements to determine piston-to-cylinder bore clearance.
  2. Measure cylinder bore 90° to crankshaft centerline at top of bore (below ring travel) and at bottom of bore (above ring travel). These measurements determine cylinder taper. Taper (difference between the 2 measurements) must not exceed .010" (.25 mm).
  3. Measure cylinder bore at center of piston travel, 90° to crankshaft centerline. Measure bore at center of piston travel in line with crankshaft centerline. Out-of-round is the difference between the 2 measurements, and must not exceed .005" (.13 mm).
  4. If taper or out-of-round are beyond limits, or cylinder walls are deeply scored, hone or bore cylinders for installation of new pistons. After cylinders have been honed or bored, measure cylinder diameter. Select proper piston to obtain specified piston to cylinder bore clearance.
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