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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Mechanical - 3.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Piston, Connecting Rod, and Bearing Cleaning and Inspection >> Piston Inspection Procedure

Piston Inspection Procedure

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    Fig 1: Identifying Piston Inspection Areas
    GM1316529Courtesy of GENERAL MOTORS CORP.
  1. Inspect the pistons for the following conditions:
    • Cracked ring lands, skirts or pin bosses
    • Ring grooves for nicks, burrs that may cause binding (5)
    • Warped or worn ring lands (5)
    • Piston pin retainer grooves for burrs (2)
    • Eroded areas at the top of the piston (1)
    • Scuffed or damaged skirt coating (4)
    • Worn piston pin bores or worn piston pins (3)
  2. Replace pistons that show any signs of damage or excessive wear.