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Fitting Pistons

  1. Standard size pistons are color coded Blue, Red and Yellow on dome of piston. Measure piston skirt diameter at 90-degree angle to piston pin. Replace piston if piston diameter is not within specification. See PISTONS PINS & RINGS  table under ENGINE SPECIFICATIONS at end of article.
  2. Measure cylinder bore at 1/2" below top of cylinder block head surface, and 1/2" above piston when at bottom of cylinder bore. If bore diameter is in lower one-third of specification, use a Red coded piston. If bore diameter is in middle one-third of specification, use a Blue coded piston.
  3. If bore diameter is in upper one-third of specification, use Yellow coded piston. Ensure piston clearance is within specification. See PISTONS PINS & RINGS  table under ENGINE SPECIFICATIONS at end of article.
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