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Fitting Pistons

  1. Measure cylinder bore diameter at top, middle and bottom of bore. Take measurements in line with and 90° to crankshaft centerline. See Figure.
  2. Difference between minimum and maximum bore diameters must not exceed 0.006" (0.15 mm). If wear exceeds limits, bore and hone cylinders for installation of oversize pistons.
    Fig 1: 1490 cc Engine Ring Gap Locations
    G09332130Courtesy of MAZDA MOTORS CORP.
    Fig 2: 1970 cc Engine Ring Gap Locations
    G09332131Courtesy of MAZDA MOTORS CORP.
  3. Inspect pistons and replace those severely damaged due to scoring, scratching or burning. Measure piston diameter 90° to pin bore, about 11/16" below lower ring groove. Use piston diameter and bore measurements to determine piston-to-cylinder bore clearance.
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