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Home >> Hummer >> 2004 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust Manifold Pipe Replacement >> Installation Procedure

Installation Procedure

    Fig 1: Exhaust Manifold Pipe
    GM863015Courtesy of GENERAL MOTORS CORP.
  1. Install a new exhaust manifold pipe seal to the exhaust manifold pipe.
  2. Install the exhaust manifold pipe.
  3. Apply lubricant to the exhaust pipe hanger bracket, in order to aid in installation.
  4. Slide the exhaust manifold pipe hanger into the exhaust pipe hanger bracket.
    5. Fig 2: Exhaust Manifold Pipe Nuts (Right)
    GM664826Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  5. Install the exhaust manifold pipe nuts.

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

    6. Fig 3: View Of O2 Sensor, Connector, Harness And Retainers
    GM664781Courtesy of GENERAL MOTORS CORP.
  6. If the exhaust manifold pipe was replaced perform the following:
    1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensor.
    2. Install the old oxygen sensor.

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

  7. If the exhaust manifold pipe was not replaced perform the following:
    1. Connect the oxygen sensor electrical connector.
    2. Connect the CPA retainer.
    3. Install the clip around the engine harness and the oxygen sensor pigtail.
  8. Install the exhaust muffler. Refer to Muffler Replacement .
  9. Install the engine protection shield. Refer to Engine Protection Shield Replacement in Frame and Underbody.

    Tighten:  Tighten the bolts to 20 N.m (15 lb ft).

  10. Lower the vehicle.
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