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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Cylinder Head Cleaning and Inspection >> Valve Inspection Procedure

Valve Inspection Procedure

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  1. Inspect the valves for the following conditions:
    • Burnt or damaged areas (1)
    • Undersized valve margin (2)
    • Bent stem (3)
    • Scoring or other damage to the stem (4)
    • Worn key groove (5)
    • Worn stem tip (6)
    2. Fig 1: View Of Valve Damage
    GM677854Courtesy of GENERAL MOTORS CORP.
  2. Inspect the valve contact surface for the following conditions:
    • Undersized margin (1)
    • Pitted surface (2)
    • Burnt or eroded areas (3)
    • Acceptable edge, margin (4)
    3. Fig 2: Inspecting Valve Face For Burning, Pitting & Cracking
    GM156173Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Minor imperfections of the valve may be corrected during reconditioning.
  3. Valves with excessive damage must be replaced.
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