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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 374 (Engine Exhaust System) >> Repair Instructions >> Exhaust Manifold Replacement - Left Side >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Locking/Unlocking Steering Column
    GM333146Courtesy of GENERAL MOTORS CORP.
  1. Install the J 42640 into the steering column lower access hole.
  2. Remove the left wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Left Side .
  3. Fully raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    4. Fig 2: Exhaust Manifold, Gasket And Catalytic Converter
    GM1708614Courtesy of GENERAL MOTORS CORP.
  4. Remove the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar).
  5. Lower the vehicle part way in order to work through the wheel opening.
    6. Fig 3: Spark Plug Wires
    GM1707125Courtesy of GENERAL MOTORS CORP.
  6. Remove the spark plug wires from the spark plugs.
    1. Twist the spark plug wire boot a 1/2 turn.
    2. Pull only on the boot in order to remove the wire from the spark plug.
  7. Remove the spark plug wires from the ignition coils.
    1. Twist the spark plug wire boot a 1/2 turn.
    2. Pull only on the boot in order to remove the wire from the ignition coil.
    8. Fig 4: Steering Shaft, Coupling Bolt And Nut
    GM1962341Courtesy of GENERAL MOTORS CORP.
  8. Mark the relationship of the upper intermediate steering shaft to the steering column.
  9. Remove the steering shaft coupling bolt (2) and nut (1) from the upper intermediate steering shaft.
  10. Separate the upper intermediate steering shaft (3) from the steering column, position both shafts out of the way.
    11. Fig 5: Exhaust Manifold, Manifold Bolts And Gasket
    GM1708615Courtesy of GENERAL MOTORS CORP.
  11. Remove the exhaust manifold bolts, and exhaust manifold.
  12. Remove and discard the exhaust manifold gasket.
  13. Remove and discard the catalytic converter seal.
    14. Fig 6: Exhaust Manifold Heat Shield And Bolts
    GM1708616Courtesy of GENERAL MOTORS CORP.
  14. If replacing the exhaust manifold, remove the exhaust manifold heat shield bolts, and shield from the exhaust manifold.
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