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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve Rocker Arm Cover Cleaning and Inspection

Valve Rocker Arm Cover Cleaning and Inspection

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: In order to ensure correct reinstallation, mark the ignition wiring harness connectors for cylinders one and three, and cylinders six and eight prior to disconnection. Failure to reconnect the ignition wiring harness connectors to the proper ignition coils may result in serious engine damage.
    NOTE: This component is initially installed using a self-tapping bolt(s). Care should be taken when removing and/or installing the self-tapping bolt(s). Failure to use care when removing and/or installing the self-tapping bolt(s) can lead to damage and unnecessary replacement of the self-tapping bolt(s) and/or the component the self-tapping bolt(s) is threaded into.
  1. Remove the white wiring harness clip locks.
  2. Disconnect the ignition coil wiring harness from the ignition coils.
  3. Remove the ignition coil wiring harness retainer bolts.
  4. Open the 2 wiring harness retainers and remove the ignition coil wiring harness.
    5. Fig 1: View Of Ignition Coil Wiring Harness
    GM1310015Courtesy of GENERAL MOTORS CORP.
  5. Remove the ignition coil bolts.
  6. Remove the ignition coils.
    7. Fig 2: View Of Ignition Coils & Bolts
    GM1310018Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
    IMPORTANT: Do not clean or submerge the ignition coils in solvent.
    Remove the ignition coils before cleaning the cover in solvent. To prevent damage to the gasket, minimize solvent contact with the gaskets.
  7. Clean the valve rocker arm cover in solvent.
  8. Dry the covers with compressed air.
  9. Inspect the covers for the following:
    • Gouges or damage to the sealing surfaces
    • Cracking or damage to the valve cover gasket
    • Debris or damage to the bolt hole threads
    10. Fig 3: View Of Valve Rocker Arm Cover & Bolts (Right)
    GM1309986Courtesy of GENERAL MOTORS CORP.
    NOTE: This bolt is a self-tapping bolt. If installing this bolt into a new component, installation of the bolt may be difficult. Ensure that the bolt is not over-torqued during the initial installation (thread cutting). Failure to limit torque can lead to bolt failure.
  10. Install the ignition coils.
    11. Fig 4: View Of Ignition Coils & Bolts
    GM1310018Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  11. Install the ignition coil bolts.

    Tighten:  Tighten the ignition coil bolts to 12 N.m (106 lb in).

  12. Install and secure the ignition coil wiring harness into the 2 wiring harness retainers.
  13. Install the ignition coil wiring harness retainer bolts.

    Tighten:  Tighten the ignition coil wiring harness retainer bolts to 12 N.m (106 lb in).

    14. Fig 5: View Of Ignition Coil Wiring Harness
    GM1310015Courtesy of GENERAL MOTORS CORP.
  14. Connect the ignition coil wiring harness to the ignition coils, making sure the connectors for cylinders 1 and 3, and cylinders 6 and 8 are connected to the corresponding ignition coils.
  15. Install the white wiring harness clip locks.
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