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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 261 (Engine Exhaust System) >> Repair Instructions >> Exhaust Seal Replacement (2500 ) >> Removal Procedure

Removal Procedure

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    Fig 1: View Of Oil Pan Skid Plate & Bolts
    GM1698083Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Loosen the 2 rear oil pan skid plate bolts, remove the 2 front oil pad skid plate bolts and skid plate, if equipped.
    3. Fig 2: View Of Engine Wiring Harness Electrical Connectors, (CPA) Retainers & Engine Harness Clip
    GM1704011Courtesy of GENERAL MOTORS CORP.
  3. Remove the right front connector position assurance (CPA) retainer (5).
  4. Disconnect the right front heated oxygen sensor (HO2S) electrical connector from the engine wiring harness electrical connector (1).
  5. Remove the right rear CPA retainer (3).
  6. Disconnect the engine wiring harness electrical connector (2) from the right rear HO2S electrical connector.
  7. Remove the right rear HO2S electrical connector clip from the engine harness clip (4).
    8. Fig 3: View Of Left Rear CPA Retainer & Engine Wiring Harness Electrical Connector
    GM1704005Courtesy of GENERAL MOTORS CORP.
  8. Remove the left rear CPA retainer (1).
  9. Disconnect the left rear HO2S electrical connector from the engine wiring harness electrical connector (3).
    10. Fig 4: View Of Left Front CPA Retainer & Engine Wiring Harness Electrical Connector
    GM1704010Courtesy of GENERAL MOTORS CORP.
  10. Remove the left front CPA retainer (2).
  11. Disconnect the left front HO2S electrical connector (2) from the engine wiring harness electrical connector (3).
    12. Fig 5: View Of Exhaust Pipe Hanger Bracket & Bolts
    GM1708691Courtesy of GENERAL MOTORS CORP.
  12. Support the catalytic converter assemblies with suitable adjustable jacks.
  13. Remove the exhaust pipe hanger bracket bolts.
    14. Fig 6: View Of Exhaust Seals & Exhaust Manifold Nuts
    GM1708627Courtesy of GENERAL MOTORS CORP.
  14. Remove the catalytic converter to exhaust manifold nuts (2).
  15. Separate the catalytic converter assemblies from the exhaust manifolds.
  16. Lower the catalytic converter assemblies using the adjustable jacks.
  17. Remove the exhaust seal(s) (1) as required.
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