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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 528 (Engine Mechanical - 5.3L, 6.0L, 6.2L - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Valve Lifter Oil Manifold Cleaning and Inspection

Valve Lifter Oil Manifold Cleaning and Inspection

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NOTE:
  • DO NOT allow dirt or debris to enter the oil passages of the Valve Lifter Oil Manifold (VLOM). Plug, as required.
  • DO NOT disassemble the electrical components from the VLOM.
  • DO NOT submerge the electrical components in cleaning solvent.
  • DO NOT use the VLOM outer gasket again. Remove the VLOM outer gasket and install a NEW VLOM outer gasket during assembly.
    Fig 1: Identifying Improper Lifting Of VLOM
    GM2044001Courtesy of GENERAL MOTORS COMPANY
  1. DO NOT lift the VLOM (2) by the electrical lead frame (1).
    2. Fig 2: View Of VLOM, Oil Pressure Sensor, Washer, Valve Lifter Oil Filter & O-Ring Seal
    GM2044519Courtesy of GENERAL MOTORS COMPANY
  2. Remove the oil pressure sensor (1) and washer (2) from the VLOM (5).
    3. NOTE:

    The valve lifter oil filter (3) should be replaced whenever the oil pressure sensor (1) is removed.

  3. Remove the valve lifter oil filter (3). Discard the filter.
    4. NOTE:

    The valve lifter oil filter O-ring seal (4) is a single use only part and must be replaced whenever the valve lifter oil filter (3) is removed.

  4. Remove and discard the valve lifter oil filter O-ring seal (4). Discard the O-ring seal.
    5. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

  5. Clean the VLOM (5) with compressed air.
    6. Fig 3: Electrical Solenoids
    GM1402153Courtesy of GENERAL MOTORS COMPANY
  6. Inspect for loose electrical solenoids (1-4) or loose or missing bolts.
  7. Inspect for damage to the electrical lead frame (5).
  8. Inspect for a damaged electrical connector, for bent or corroded pins.
    9. Fig 4: Sealing Gaskets
    GM1402154Courtesy of GENERAL MOTORS COMPANY
  9. Inspect for damaged VLOM inner gaskets (1-8). If the VLOM inner gaskets are damaged, the VLOM must be replaced as an assembly.
  10. Inspect for a damaged VLOM outer gasket (9) or scored gasket surfaces.
  11. Inspect for debris or restrictions within the oil passages of the VLOM. Refer to Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing .
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