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Home >> Chevrolet >> 2017 >> Suburban 3500 HD LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Mechanical - 5.3L (L83) Or 6.2L (L86)) >> 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: Oil Pressure Sensor, VLOM Plug And PCV Assembly
    GM2889908Courtesy of GENERAL MOTORS COMPANY
  2. Remove the oil pressure sensor (1) from the VLOM.
  3. Remove the VLOM plug (2).
  4. Remove the PCV assembly (3).
    5. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

  5. Clean the VLOM with compressed air.
    6. Fig 3: Inspecting Manifold
    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: Inspecting Manifold For Seal & Gasket Leaks
    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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