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Home >> Chevrolet >> 2012 >> Tahoe PPV >> Repair and Diagnosis >> External Pages >> Different car >> Section 1677 (Engine Mechanical - 6.6L (LMM) - Repair Instructions - Off Vehicle (2 Of 3)) >> Valve and Seat Grinding

Valve and Seat Grinding

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: 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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