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Fitting Pistons

  1. Measure piston across skirt. Check piston for scoring or cracks. Measure cylinder bore and determine if clearance is excessive.
  2. Two grades of standard pistons are used; F and G. Identification mark is on piston head and block. One oversize piston is available; 0.001" (0.025 mm). It will be necessary to hone cylinder to insert oversize piston.
  3. Install expanding ring in bottom groove of piston with end butting, but not overlapping. Work from bottom of piston and fit bottom rail. Fit top rail into position going over head of piston. Install middle ring with "TOP" facing up. Put on upper compression ring. Stagger rings.
Fig 1: Order and Detail of Piston Ring Installation
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