GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 2WD 🢒 Engine 🢒 Engine Mechanical - 6.6L 🢒 Valve Rocker Arm Cover Replacement - Upper Left Side

Removal Procedure
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .

    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. Object Number: 1409332 Size: SH
  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. Object Number: 1378748 Size: SH
  10. Disconnect the fuel lines. Refer to Metal Collar Quick Connect Fitting Service .
  11. Remove the fuel hose bracket nut.

    12. Object Number: 1873022 Size: SH
  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. Object Number: 1873036 Size: SH
  15. Disconnect the turbocharger vane position sensor electrical connector (1).

    16. Object Number: 1873197 Size: SH
  16. Unclip the main engine electrical harness connectors from the main electrical connector harness bracket.

    17. Object Number: 1873209 Size: SH
  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 .
  20. Remove the auxiliary generator, if equipped. Refer to Auxiliary Generator Replacement .
  21. Remove the positive crankcase ventilation (PCV) hose/pipe. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement .

    22. Object Number: 1335608 Size: SH
  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 Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

    24. Notice: 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. Object Number: 1335635 Size: SH
  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 .

Installation Procedure

    Object Number: 1335635 Size: SH
  1. Install the valve rocker arm cover gasket.
  2. Install the upper valve rocker arm cover.
  3. Install the upper valve rocker arm cover bolts.

    4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1411030 Size: SH
  4. Tighten the upper valve rocker arm cover bolts in the sequence shown.

    5. Tighten
    Tighten the bolts to 8 N·m (71 lb in).


    Object Number: 1335608 Size: SH

    Notice: Ensure proper torquing of the fuel injector line. An under-torqued fuel injector line will not seal properly and an over-torqued fuel injector line may damage the fuel injector fitting. An improperly sealed or damaged fuel injector line or fuel injector fitting will cause a fuel leak.

  5. Install the left fuel injector pipes.

    6. Tighten
    Tighten the pipes to 41 N·m (30 lb ft).

  6. Install the water outlet tube. Refer to Water Outlet Tube Replacement .
  7. Install the auxiliary generator, if equipped. Refer to Auxiliary Generator Replacement .
  8. Install the PCV hose/pipe. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement .

    9. Object Number: 1873209 Size: SH
  9. Install the main electrical connector harness bracket (2).
  10. Install the main electrical connector harness bracket bolts (1).

    11. Tighten
    Tighten the bolts to 21 N·m (15 lb ft).


    Object Number: 1873197 Size: SH
  11. Clip the main engine electrical harness connectors to the main electrical connector harness bracket.

    12. Object Number: 1873036 Size: SH
  12. Connect the turbocharger vane position sensor electrical connector (1).

    13. Object Number: 1873022 Size: SH
  13. Connect the main engine electrical harness connectors.
  14. Push down on the latches (1) in order to connect the connectors.
  15. Close the harness clip (2).

    16. Object Number: 1378748 Size: SH
  16. Connect the fuel lines. Refer to Metal Collar Quick Connect Fitting Service .
  17. Install the fuel hose bracket nut.

    18. Tighten
    Tighten the nut to 21 N·m (15 lb ft).


    Object Number: 1409332 Size: SH
  18. Position the generator positive cable.
  19. Install the generator positive cable in the clip on the engine front cover.
  20. Install the generator positive cable and nut.

    21. Tighten
    Tighten the nut to 9 N·m (80 lb in).

  21. Install the positive battery cable junction block bracket and bolt (1) to the power steering pump.

    22. Tighten
    Tighten the bolt to 9 N·m (80 lb in).

  22. Remove the tape from the turbocharger openings.
  23. Install the charged air cooler inlet duct. Refer to Charge Air Cooler Inlet Pipe Replacement .
  24. Fill the cooling system. Refer to Cooling System Draining and Filling .
  25. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  26. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .