GM Service Manual Online
For 1990-2009 cars
Makes 🢒 Chevrolet 🢒 2004 🢒 Tahoe - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Valve Rocker Arm Cover Replacement - Left Side

Removal Procedure

    Object Number: 757686 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) to the ignition coil wire harness.
  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: 1342458 Size: SH
  7. Remove the ignition coil bracket studs.
  8. Remove the ignition coil bracket.

    9. Object Number: 1201537 Size: SH
  9. Remove the positive crankcase ventilation (PCV) hose.

    10. Object Number: 1277108 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. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1277108 Size: SH
  2. Install the valve rocker arm cover.
  3. Tighten the rocker arm cover bolts.

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


    Object Number: 1201537 Size: SH
  4. Install the PCV hose.

    5. Object Number: 1342458 Size: SH
  5. Apply threadlocker to the threads of the bracket bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.
  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: 757686 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) to the ignition coil wire harness.
  12. Install the CPA lock.
  13. Install the engine sight shield, if required. Refer to Upper Intake Manifold Sight Shield Replacement .