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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (Engine Mechanical - 6.6L - Off Vehicle Repair Instructions (2 Of 3)) >> Off-Vehicle Repair Instructions (Part 2) >> Valve and Seat Grinding

Valve and Seat Grinding

WARNING: This page is about a different variant/trim than selected.
  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.
    Fig 1: Cleaning Up Valve Seat
    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.
    Fig 2: Lapping Valve Face
    GM663569Courtesy of GENERAL MOTORS CORP.
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