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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 722 (Engine Mechanical - 8.1L (Unit Repair)) >> Repair Instructions >> Valve Guide Reaming/Valve and Seat Grinding >> Valve Reconditioning Procedure

Valve Reconditioning Procedure

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Replace the valve if the valve stem shows excessive wear or is warped.

    Important:  Several different types of equipment are available for reconditioning valves. Use the manufacturers recommendations of equipment to attain the proper results.

  2. Reface pitted valves on a valve refacing machine in order to insure the correct relationship between the head and the stem.
  3. Replace the valve if the edge of the head is less than 0.79 mm (0.031 in) thick after grinding.
    Fig 1: Inspecting Valve Head Edge
    G01675487Courtesy of GENERAL MOTORS CORP.
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