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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Engine Mechanical) >> 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 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Ignition Coil, Bracket Assembly, Wire Harness & Bolts (Left)
    GM1342458Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Do not use the valve rocker arm cover gasket again. Install a NEW gasket during assembly.
    • Remove the ignition coils before cleaning the cover in solvent. Do not submerge the ignition coils in solvent.
    • Do not remove the oil fill tube or crankcase vent valve grommet from the covers unless service is required.
    • If the oil fill tube or crankcase vent valve grommet have been removed from the rocker arm covers, install a NEW tube or grommet during assembly.
  1. Remove the ignition coil and bracket assembly, bolts, and wire harness from the left cover, if required.
    2. Fig 2: View Of Ignition Coil, Bracket Assembly & Bolts (Right)
    GM260090Courtesy of GENERAL MOTORS CORP.
  2. Remove the ignition coil and bracket assembly, bolts, and wire harness from the right cover, if required.
    3. Fig 3: View Of Oil Fill Cap & Tube
    GM260110Courtesy of GENERAL MOTORS CORP.
  3. Inspect the tube for a loose fit or damage.
  4. Remove the oil fill cap and tube from the right cover, if required.
    5. Fig 4: View Of Valve Rocker Arm Cover Gasket
    GM1272820Courtesy of GENERAL MOTORS CORP.
  5. Remove the gaskets (504) from the covers.
  6. Remove the cover mounting bolts, with grommets.

    Cover mounting bolts and grommets that are not damaged may be used again during assembly.

  7. Clean the covers in solvent.
    8. Fig 5: View Of Valve Rocker Arm Cover
    GM1277108Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Safety Glasses Caution .
  8. Dry the covers with compressed air.
  9. Inspect the ventilation system passages for restrictions.
  10. Inspect the gasket grooves for damage.
  11. Inspect the coil bracket threaded bolt holes for damage or debris.
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