GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 6.6L 🢒 Valve Rocker Arm Cover Replacement - Lower Left Side

Removal Procedure

    Object Number: 660472 Size: SH
  1. Remove the upper left valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Upper Left Side .
  2. Disconnect the injector wiring harness connectors.

    3. Important: Do not drop the injector harness bolts in the cylinder head oil return ports.

  3. Remove the injector harness bracket bolts for both injector harnesses.
  4. Remove the encapsulated injector wire terminal nuts on each injector.
  5. Remove both injector harnesses.

    6. Object Number: 660473 Size: SH
  6. Remove the 12 lower valve rocker arm cover bolts.
  7. Remove the lower valve rocker arm cover.
  8. Remove the gasket from the lower valve rocker arm cover.
  9. Inspect the lower valve rocker arm cover gasket for damage, replace if necessary. Otherwise reuse the old gasket.
  10. Remove the bolt grommets from the lower valve rocker arm cover.

    11. Object Number: 663626 Size: SH
  11. Clean the lower valve rocker arm cover. Remove any sludge or other deposits.
  12. Clean the lower valve rocker arm cover sealing surfaces.
  13. Inspect the lower valve rocker arm cover for cracks or any damage.
  14. Inspect the lower valve rocker arm cover sealing surfaces for damage.
  15. Replace the lower valve rocker arm cover if any damage is found.

Installation Procedure

    Object Number: 660473 Size: SH
  1. Install the lower valve rocker arm cover gasket in the lower valve rocker arm cover.
  2. Install the bolt grommets in the lower valve rocker arm cover.
  3. Install the lower valve rocker arm cover.

    4. Object Number: 663902 Size: SH

    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.

  4. Install the 12 bolts for the lower valve rocker arm cover.

    5. The lower valve rocker arm cover is tightened 2 times in the numerical order.

    Bolts number 1 and 2 are used to position the cover.

    Tighten

    1. Tighten the lower valve rocker arm cover bolts to 10 N·m (89 lb in) in the proper sequence.
    2. Retighten the lower valve rocker arm cover bolts to 10 N·m (89 lb in) in the proper sequence.

    Object Number: 660472 Size: SH
  5. Install the injector harnesses.
  6. Install the injector harness bracket bolts.

    7. Tighten
    Tighten the injector harness bolts to 9 N·m (80 lb in).

  7. Install the injector wire terminals and nuts to the injectors.

    8. Tighten
    Tighten the injector wire terminal nuts to 1.5 N·m (13 lb in).

  8. Connect injector wiring harnesses connectors.
  9. Install the upper left valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Upper Left Side .