GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 TrailBlazer - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.2L 🢒 Camshaft Cover Replacement

Removal Procedure
  1. Remove the intake manifold. Refer to Intake Manifold Replacement .

    2. Object Number: 754343 Size: SH
  2. Remove the A/C line at the oil level indicator tube bracket nut.

    3. Object Number: 754344 Size: SH
  3. Remove the A/C bracket bolt from the engine lift hook.
  4. Position the A/C line out of the way.

    5. Object Number: 750247 Size: SH
  5. Remove the engine lift bracket.
  6. Disconnect the ignition control module electrical connectors.
  7. Loosen the ignition control module bolts.

    8. Object Number: 750246 Size: SH
  8. Remove the ignition control module.

    9. Object Number: 750195 Size: SH
  9. Disconnect the engine electrical harness housing from the camshaft cover (1) taking care not to damage the clips that hold the housing in place.
  10. Disconnect the fuel injection harness electrical connector.

    11. Object Number: 750238 Size: SH
  11. Loosen and remove the camshaft cover bolts.

    12. Object Number: 637618 Size: SH
  12. Remove the camshaft cover.
  13. Clean and inspect the camshaft cover. Refer to Camshaft Cover Cleaning and Inspection .

Installation Procedure
  1. Install a new camshaft cover seal.
  2. Install new rubber ignition control module seals.

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


    Object Number: 637618 Size: SH
  3. Install the camshaft cover and secure with the cam cover bolts.

    4. Tighten
    Tighten the camshaft cover bolts to 10 N·m (89 lb in).


    Object Number: 750246 Size: SH
  4. Install the ignition control modules and secure the modules with bolts.

    5. Tighten
    Tighten the ignition coil bolts to 10 N·m (89 lb in).

  5. Connect the ignition control module electrical connectors.
  6. Install the fuel injector electrical connectors.

    7. Object Number: 750195 Size: SH
  7. Install the engine electrical harness housing (1).

    8. Object Number: 754343 Size: SH
  8. Install the A/C line bracket to the oil level indicator tube stud and secure the bracket with the nut.

    9. Tighten
    Tighten the A/C line bracket nut to 7 N·m (62 lb in).

  9. Install the engine lift bracket and secure the lift hook with the bolts.

    10. Tighten
    Tighten the lift bracket bolts to 50 N·m (37 lb ft).


    Object Number: 754344 Size: SH
  10. Install the A/C line bracket to the engine lift bracket and secure the A/C bracket with the bolt.

    11. Tighten
    Tighten the A/C bracket bolt to 10 N·m (89 lb in).

  11. Install the intake manifold. Refer to Intake Manifold Replacement .