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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1406 (Engine Mechanical - 6.6L (4 Of 5)) >> Repair Instructions - Off Vehicle (3 Of 4) >> Valve and Seat Grinding

Valve and Seat Grinding

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Grinding Valve
    GM663566Courtesy of GENERAL MOTORS CORP.
  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 2: Turning Valve Back & Forth
    GM663569Courtesy 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.
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