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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve and Seat Grinding

Valve and Seat Grinding

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the carbon from the valve guide and valve seat surface.
  2. Resurface the valve face to 45 degrees. If valve margin falls below specifications after resurfacing then discard valve.
  3. Use a suitable tool to bring the valve contact width to the standard value. The valve seat angle is 45 degrees.
    4. Fig 1: Resurfacing Valve Face
    GM663566Courtesy of GENERAL MOTORS CORP.
  4. Apply valve lapping compound to the valve seat surface.
  5. Insert the valve into the cylinder head.
  6. Turn the valve back and forth in its seat to lap the valve face to the valve seat.
    7. Fig 2: Inserting Valve Into Cylinder Head
    GM663569Courtesy of GENERAL MOTORS CORP.
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