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Home >> Cadillac >> 2005 >> STS 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Mechanical - 4.6L (LH2) (4 Of 6)) >> Off-Vehicle Repair Instructions - Part 2 >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston Inspection Procedure

Piston Inspection Procedure

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    Fig 1: Inspecting Piston
    GM880609Courtesy of GENERAL MOTORS CORP.
  1. Inspect the top of the piston (1) for erosion.
  2. Inspect the ring lands and ring grooves (2) for cracks, warpage, wear and nicks/burrs that cause binding.
  3. Inspect the piston skirt coating (3) for excessive wear.
  4. Inspect the piston skirt (4) for cracks.
  5. Inspect the piston pin bore (5) for wear, cracks and pin retainer grooves (6) for burrs.
  6. Fig 2: Measuring Piston Pin Diameter
    GM4976Courtesy of GENERAL MOTORS CORP.
  7. Replace any piston and/or piston pin that have damage or excessive wear.