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Fitting Pistons

  1. Measure cylinder bore 3/8" (10 mm) down from top, 3/8" (10 mm) from bottom, and at center of bore. Measure in-line with thrust face and at 90 degree angle to thrust face. For cylinder bore specifications, see CYLINDER BORE SPECIFICATIONS  table.
    CYLINDER BORE SPECIFICATIONS

    Application In. (mm)
    Wear Limit .0027 (.07)
    Out-Of-Round .002 (.050)
    Maximum Taper .005 (.125)
  2. Measure pistons with pins removed at points "A", "B", "C" and "D". See Fig 1. Measure point "B". Piston diameter should be 3.4430-3.4450" (87.442-87.507 mm). Measure point "A". Due to elliptical shape of piston skirt, point "A" should be .012-.014" (.305-.356 mm) less than measurement taken at point "B".
    Fig 1: Measuring Piston Fit
    G91275Courtesy of CHRYSLER MOTORS.
  3. Measure point "C" and point "D". Piston diameter at point "D" should be .002" (.05 mm) larger than measurement taken at point "C". If piston is not within specification, replace as required. Pistons are available in standard and .020" oversize.
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