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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Mechanical - 6.6L - On Vehicle Repair Instructions) >> On-Vehicle Repair Instructions >> Cylinder Head Replacement - Left >> Removal Procedure

Removal Procedure

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  1. Remove the thermostat housing crossover. Refer to Thermostat Housing Crossover Replacement (6.6L (LLY) Engine) .
  2. Remove the intake manifold. Refer to Intake Manifold Replacement - Left .
  3. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement - Left (6.6L (LLY) Engine) .
  4. Remove the bolt and ground straps from the rear of the cylinder head.
  5. Remove the valve rocker arm shaft, pushrods, and valve bridges. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement .
  6. Remove the glow plugs. Refer to Glow Plug Replacement - Bank 2 .
  7. Remove the cylinder head bolts in the sequence shown.
    Fig 1: Cylinder Head Bolt Removal Sequence
    GM1336109Courtesy of GENERAL MOTORS CORP.
  8. Discard the large M12 bolts.
  9. Remove the cylinder head.
    Fig 2: View Of Left Cylinder Head Gasket
    GM1336110Courtesy of GENERAL MOTORS CORP.
  10. Remove and discard the cylinder head gasket.
  11. Clean the sealing surface of the engine block and the cylinder head.
    NOTE: Clean all dirt, debris, and coolant from the engine block cylinder head bolt holes. Failure to remove all foreign material may result in damaged threads, improperly tightened fasteners or damage to components.
  12. Clean the cylinder head bolt holes in the engine block.
  13. For service to the cylinder head refer to the following:
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