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Home › Hummer › 2008 › H2 4D Utility Pickup › Repair and Diagnosis › Engine Mechanical › Engine Exhaust › Repair Instructions › Catalytic Converter Replacement › Installation Procedure

Installation Procedure

    Fig 1: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  1. If the catalytic converter was replaced, perform the following:
    1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensors.
    2. Install the oxygen sensors.

      Tighten:  Tighten the oxygen sensors to 42 N.m (31 lb ft).

  2. Install the catalytic convertor.
    3. Fig 2: View Of Right Exhaust Pipe Nuts
    GM858553Courtesy of GENERAL MOTORS CORP.
  3. Install NEW exhaust manifold pipe seals to the exhaust manifolds.
  4. Install the right exhaust manifold pipe nuts until snug.
    5. Fig 3: View Of Left Exhaust Manifold Pipe & Nuts
    GM858550Courtesy of GENERAL MOTORS CORP.
  5. Install the left exhaust manifold pipe nuts until snug.
  6. Tighten the right and left exhaust manifold pipe nuts.

    Tighten:  Tighten the nuts to 50 N.m (39 lb ft).

    7. Fig 4: Exhaust Muffler Nuts
    GM664840Courtesy of GENERAL MOTORS CORP.
  7. Install the exhaust muffler nuts.

    Tighten:  Tighten the nuts to 40 N.m (30 lb ft).

    8. Fig 5: View Of O2 Sensor Harness Routing
    GM664951Courtesy of GENERAL MOTORS CORP.
  8. Connect the oxygen sensor electrical connectors (1, 2).
  9. Connect the CPA retainers.
  10. Clip the oxygen sensors electrical connectors to the following:
    • Hose clip
    • Transmission crossmember
    11. Fig 6: View Of O2 Sensor Harness Routing And Harness Mounting Brackets
    GM664828Courtesy of GENERAL MOTORS CORP.
  11. Connect the oxygen sensor electrical connectors.
  12. Connect the CPA retainers.
  13. Install the clip around the engine harness and the oxygen sensor pigtail.
    14. Fig 7: View Of Transmission Crossmember
    GM702036Courtesy of GENERAL MOTORS CORP.
  14. Install the transmission support crossmember.
  15. Install the transmission support crossmember bolts and nuts.

    Tighten:  Tighten the bolts to 95 N.m (70 lb ft).

    16. Fig 8: Identifying Transmission Mount Nuts
    GM647997Courtesy of GENERAL MOTORS CORP.
  16. lower the transmission onto the transmission support.
  17. Install the transmission mount to transmission support nuts.

    Tighten:  Tighten the nuts to 40 N.m (30 lb ft).

  18. Remove the transmission jack.
  19. Lower the vehicle.
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