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Fitting Pistons

  1. To determine if piston-to-cylinder clearance is within specification, measure piston skirt diameter at 90-degree angle to piston pin.
  2. Measure piston diameter at .43" (11 mm) from bottom of piston skirt. Different sized standard pistons are used. Piston size can be identified by No. 1, 2 or 3 grade number stamped on top of piston. See Figure .
  3. Piston diameter must be within specification. See PISTONS, PINS & RINGS  table under ENGINE SPECIFICATIONS.
  4. Cylinder bore diameter is measured at .39" (10 mm), 2.36" (60 mm) and 3.94" (100 mm) from top of cylinder bore. Different cylinder bores are used and can be identified by No. 1, 2 or 3 grade number stamped on deck surface in accordance with cylinder location. See Figure .
  5. Cylinder bore diameter must be within specification. See CYLINDER BLOCK  table under ENGINE SPECIFICATIONS. Determine piston clearance. Replace piston or bore cylinder block if clearance is not within specification. See PISTONS, PINS & RINGS  table. Pistons are available in .0079" (.200 mm) oversize.
CAUTION: Ensure main bearing caps are installed with bolts tightened to specification when boring cylinder block.
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