GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Yukon - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Valve Rocker Arm Cover Replacement - Left Side

Removal Procedure

    Object Number: 679597 Size: SH
  1. Remove the engine sight shield, if required. Refer to Upper Intake Manifold Sight Shield Replacement .
  2. Remove the connector position assurance (CPA) lock.
  3. Disconnect the main electrical connector (2) feeding the ignition coils.
  4. Remove the harness clips (1).
  5. Reposition the engine harness, if necessary.
  6. Remove the spark plug wires from the ignition coils.
    7. • Twist each plug wire 1/2 turn.
    • Pull only on the boot in order to remove the wire from the ignition coil.

    Object Number: 832184 Size: SH
  7. Remove the ignition coil bracket studs.
  8. Remove the ignition bracket.

    9. Object Number: 647793 Size: SH
  9. Remove the positive crankcase ventilation (PCV) hose.

    10. Object Number: 832209 Size: SH
  10. Loosen the valve rocker arm cover bolts.
  11. Remove the valve rocker arm cover.

    12. Object Number: 490696 Size: SH
  12. Remove and discard the old gasket (1).
  13. If required, clean and inspect the rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection .

Installation Procedure

Important: 

   • All gasket surfaces should be free of oil an/or other foreign material during assembly.
   • DO NOT reuse the valve rocker arm cover gasket.
   • If the PCV valve grommet has been removed from the rocker cover, install a NEW grommet during assembly.


    Object Number: 490696 Size: SH
  1. Install a NEW rocker cover gasket (1).

    2. Object Number: 832209 Size: SH
  2. Install the valve rocker arm cover.

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Tighten the rocker arm cover bolts.

    4. Tighten
    Tighten the bolts to 12 N·m (106 lb in).


    Object Number: 647793 Size: SH
  4. Install the PCV hose to the rocker arm cover.

    5. Object Number: 832184 Size: SH
  5. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the coil bracket studs.
  6. Install the ignition coil bracket.
  7. Install the ignition coil bracket studs.

    8. Tighten
    Tighten the studs to 12 N·m (106 lb in).


    Object Number: 679597 Size: SH
  8. Install the spark plug wires to the ignition coils.
  9. Position the engine harness, if necessary.
  10. Install the harness clips (1).
  11. Connect the main electrical connector (2) feeding the ignition coils.
  12. Install the CPA lock.
  13. Install the engine sight shield, if required. Refer to Upper Intake Manifold Sight Shield Replacement .