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Fitting Pistons

  1. Different piston sizes and cylinder bore sizes are used. Piston diameter is determined by size mark ("0", "1", "2", "3" or "4") stamped on top of piston. See Figure. Cylinder bore diameter is determined size mark ("0", "1", "2", "3" or "4") stamped on cylinder block. See Fig 1. To determine piston-to-cylinder clearance, measure piston diameter and cylinder bore diameter.
  2. Measure piston skirt diameter .87" (22.0 mm) from top of piston, at 90-degree angle to piston. Ensure piston diameter is within specification. See PISTONS, PINS & RINGS  table under ENGINE SPECIFICATIONS.
  3. Measure cylinder bore diameter at following places: .39" (9.9 mm) from top and bottom of cylinder bore, and at middle of cylinder bore. Ensure cylinder bore diameter is within specification. See CYLINDER BLOCK  table under ENGINE SPECIFICATIONS.
  4. If clearance is not within specification, replace piston or bore cylinder block. See PISTONS, PINS & RINGS  table. Cylinder block can be bored for .020" (.50 mm) oversize pistons.
Fig 1: Identifying Cylinder Bore Size Marks
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