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Home >> Subaru >> 1981 >> GLF Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 1600 & 1800 4-Cylinder >> Pistons, Pins & Rings >> Fitting Pistons

Fitting Pistons

  1. Measure piston bore 0.028" (0.7 mm) from top of cylinder in line with crankshaft and again 90° from centerline of crankshaft. Make same measurements 1.48" (37 mm) and then 2.65" (67 mm) from top of cylinder bore. If inner cylinder diameter exceeds 0.0197" (0.50 mm) more than standard bore of 3.6205-3.6216" (91.960-91.990 mm) after boring and honing, replace crankcase.
  2. 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 at same size and use same size pistons.
  3. Check piston ring end gap and side clearance. Check gap at bottom of cylinder bore. Fit piston rings with "R" or "N" facing up.
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