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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1072 (Engine Mechanical - 6.6L (2 Of 5)) >> On-Vehicle Repair Instructions >> Valve Rocker Arm Cover Replacement - Upper Left Side >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) or Cooling System Draining and Filling (Static Fill) .
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (w/Single Battery) or Battery Negative Cable Disconnection and Connection (w/Auxiliary Battery) or Battery Negative Cable Disconnection and Connection (w/Dual Batteries) .
    4. IMPORTANT: After removing the charged air cooler duct, cover the turbocharger opening with tape in order to prevent entry of objects.
  4. Remove the charged air cooler inlet duct. Refer to Charge Air Cooler Inlet Pipe Replacement .
    5. Fig 1: View Of Battery Cable Junction Block Bolt At Power Steering Pump Bracket
    GM1409332Courtesy of GENERAL MOTORS CORP.
  5. Remove the battery cable to generator nut.
  6. If equipped, remove the battery cable to the auxiliary generator.
  7. Remove the battery cable harness clip from the bracket.
  8. Remove the battery cable junction block bolt (1) from the power steering pump.
  9. Move and secure the battery cables out of the way.
    10. Fig 2: View Of Fuel Line Bracket & Nut
    GM1378748Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the fuel lines. Refer to Metal Collar Quick Connect Fitting Service .
  11. Remove the fuel hose bracket nut.
    12. Fig 3: View Of Main Engine Electrical Harness Connector Latches & Clips
    GM1873022Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the main engine electrical harness connectors. Lift up on the latches (1) in order to disconnect the connectors.
  13. Open the harness clip (2).
  14. Remove the main engine electrical harness connectors.
    15. Fig 4: View Of Turbocharger Vane Position Sensor Electrical Connector
    GM1873036Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the turbocharger vane position sensor electrical connector (1).
    16. Fig 5: View Of Main Engine Electrical Harness Connectors & Latches
    GM1873197Courtesy of GENERAL MOTORS CORP.
  16. Unclip the main engine electrical harness connectors from the main electrical connector harness bracket.
    17. Fig 6: View Of Main Electrical Harness Bracket & Bolts
    GM1873209Courtesy of GENERAL MOTORS CORP.
  17. Remove the main electrical connector harness bracket bolts (1).
  18. Remove the main electrical connector harness bracket (2).
  19. Remove the water outlet tube. Refer to Water Outlet Tube Replacement (LMM) .
  20. Remove the auxiliary generator, if equipped. Refer to Auxiliary Generator Replacement (6.6L) .
  21. Remove the positive crankcase ventilation (PCV) hose/pipe. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement .
    22. Fig 7: View Of Left Fuel Injector Pipes
    GM1335608Courtesy of GENERAL MOTORS CORP.
  22. Prior to removing the fuel injector pipes, use compressed air to blow any debris from between the injector line and fittings. Wipe the fittings clean of debris.
  23. Spray lithium grease between the fuel injector line and fittings to assist in containing any debris during removal. Refer to Sealers, Adhesives, and Lubricants for the correct part number.
    24. NOTE: DO NOT use compressed air to clean debris from the fuel injector inlet after the fuel line is removed. Using compressed air can allow debris to enter the fuel injector inlet and damage the fuel injector.
  24. Remove the left fuel injector pipes.
    25. Fig 8: View Of Upper Valve Rocker Arm Cover & Gasket
    GM1335635Courtesy of GENERAL MOTORS CORP.
  25. Remove the upper valve rocker arm cover bolts.
  26. Remove the upper valve rocker arm cover.
  27. Remove the upper valve rocker arm cover gasket.
  28. Inspect the upper valve rocker arm cover gasket for damage, replace if necessary. Otherwise reuse the old gasket.
  29. If required, clean and inspect the upper valve rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection - Upper .
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