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Home › Hummer › 2005 › H2 4D Utility Pickup › Repair and Diagnosis › Engine Mechanical › Engine Exhaust System › 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 in Cautions and Notices.
  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. Fig 2: Exhaust Manifold Pipe
    GM863015Courtesy of GENERAL MOTORS CORP.
  2. Install a NEW exhaust seal to the exhaust manifold.
  3. Install the catalytic converter.
    4. Fig 3: Exhaust Manifold Pipe Nuts (Left)
    GM309165Courtesy of GENERAL MOTORS CORP.
  4. Install the left exhaust manifold pipe nuts.

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

  5. Install the catalytic converter to muffler flange nuts.

    Tighten:  Tighten the nuts to 48 N.m (35 lb ft).

    6. Fig 4: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  6. Connect the oxygen sensor electrical connectors (1, 2).
  7. Connect the CPA retainers.
    8. Fig 5: Catalytic Converter Guard
    GM794712Courtesy of GENERAL MOTORS CORP.
  8. Install the catalytic converter guard. Refer to Catalytic Converter Guard Replacement in Frame and Underbody.
  9. Lower the vehicle.
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