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

Installation Procedure

    Fig 1: Exhaust Manifold Pipe Nuts (Left)
    GM309165Courtesy of GENERAL MOTORS CORP.
  1. Install the exhaust manifold pipe seal(s).
  2. Raise the catalytic converter or exhaust manifold pipe using the adjustable jackstands.
  3. Install the exhaust hanger mounting bracket bolts.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Install the left exhaust manifold pipe nuts.

    Tighten: 

    • Tighten the transmission bolts to 100 N.m (74 lb ft).
    • Tighten the exhaust pipe hanger bracket bolts to 12 N.m (106 lb in).
    • Tighten the exhaust manifold pipe nuts to 50 N.m (39 lb ft).

    5. Fig 2: Exhaust Manifold Pipe Nuts
    GM664826Courtesy of GENERAL MOTORS CORP.
  5. Install the right exhaust manifold pipe nuts.

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

    6. Fig 3: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  6. Connect the oxygen sensor electrical connector (1).
  7. Connect the CPA retainer.
  8. Remove the adjustable jackstands from catalytic converter or exhaust manifold pipe.
  9. Install the engine protection shields. 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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