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Fitting Pistons

  1. Measure cylinder bore 0.028" (0.7 mm) from top of cylinder in line with crankshaft and again 90° from centerline of crankshaft. Also measure bore 1.48" (37 mm) and then 2.65" (67 mm) from top of cylinder.
  2. After boring and honing, if cylinder bore diameter is 0.0197" (0.50 mm) more than standard bore of 3.6205-3.6216" (91.960-91.990 mm), replace crankcase.
  3. Measure piston 1.04" (26.3 mm) from bottom of skirt, 90° from piston pin hole.
    NOTE: Measurement of both pistons and cylinder bores should be performed at 68°F (20°C). All cylinders must be bored to same size and use same size pistons.
  4. Check piston ring end gap and side clearance. Check gap at bottom of cylinder bore. Fit piston rings with "R" or "N" facing up.
    Fig 1: Piston Ring Gap Position
    G09332278Courtesy of SUBARU OF AMERICA, INC.
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