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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 994 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement - Left >> Removal Procedure

Removal Procedure

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 thermostat housing crossover. Refer to Thermostat Housing Crossover Replacement (6.6L (LLY) Engine) in Engine Cooling.
  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) in Engine Exhaust.
  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 in Engine Controls - 6.6L (LLY).
  7. Remove the cylinder head bolts in the sequence shown.
    8. Fig 1: Cylinder Head Bolt Removal Sequence
    GM1336109Courtesy of GENERAL MOTORS CORP.
  8. Discard the large M12 bolts.
  9. Remove the cylinder head.
  10. Remove and discard the cylinder head gasket.
    11. Fig 2: View Of Left Cylinder Head Gasket
    GM1336110Courtesy of GENERAL MOTORS CORP.
  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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