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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 518 (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 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 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 COMPANY
  1. Install the J 42640  steering column anti-rotation pin 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: View Of Exhaust Manifold, Gasket & Catalytic Converter
    GM1708614Courtesy of GENERAL MOTORS COMPANY
  4. Remove the catalytic converter to exhaust manifold nuts. (1500 series shown in illustration, 2500 series similar).
  5. Lower the vehicle part way in order to work through the wheel opening.
    6. Fig 3: View of Spark Plug Wires
    GM1707125Courtesy of GENERAL MOTORS COMPANY
  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: View Of Steering Shaft, Coupling Bolt & Nut
    GM1962341Courtesy of GENERAL MOTORS COMPANY
  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: View Of Exhaust Manifold, Manifold Bolts & Gasket
    GM1708615Courtesy of GENERAL MOTORS COMPANY
  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: View Of Exhaust Manifold Heat Shield & Bolts
    GM1708616Courtesy of GENERAL MOTORS COMPANY
  14. If replacing the exhaust manifold, remove the exhaust manifold heat shield bolts, and shield from the exhaust manifold.
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