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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Mechanical - 4.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> 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 pistons for the following conditions:
    • Eroded areas at the top of the piston (1)
    • Ring grooves for nicks, burrs that may cause binding (2)
    • Warped or worn ring lands (2)
    • Scuffed or damaged skirt coating (3)
    • Cracked ring lands, skirts or pin bosses (4)
    • Worn piston pin bores or worn piston pins (5)
    • Piston pin retainer grooves for burrs (6)
  2. Replace pistons that show any signs of damage or excessive wear.