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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 Muffler Replacement (LC9, LMG, LZ1, L20) >> Removal Procedure

Removal Procedure

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WARNING:

Refer to Exhaust Service Warning .

    Fig 1: View Of Chassis Wiring Harness Electrical Connectors & Right Rear Wheel Speed Sensor Wiring Harness Electrical Connector
    GM1709051Courtesy of GENERAL MOTORS COMPANY
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the chassis wiring harness electrical connector (1) from the right rear wheel speed sensor wiring harness electrical connector (2).
  3. If the vehicle is equipped with regular production option (RPO) Z55, disconnect the chassis wiring harness electrical connector (3) from the right rear shock absorber.
  4. If the vehicle is equipped with RPO Z55, disconnect the right rear air line from the shock absorber.
  5. Remove the right rear wheel speed sensor wiring harness electrical connector clip from the frame.
    6. Fig 2: View Of Right Axle Tie Rod Bolt & Nut
    GM1709061Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The rear axle wiring harness clip is a one way clip with a D-shape section. The clip can only be installed and/or removed in only one direction.

  6. Remove the right rear wheel speed sensor wiring harness clips from the frame and the control arm bracket.
    7. NOTE:

    Do not attempt to pry the rear suspension sensor link rod from the rear position sensor ball stud.

  7. Disconnect the right rear automatic level control sensor link rod from the sensor. Perform the following:
    1. Support the sensor lever with your hand.
    2. Twist the link rod ball in order to separate it from the ball stud.
  8. Install a suitable adjustable jack under the rear axle.
  9. Remove the right axle tie rod bolt (2) and nut (1).
    10. Fig 3: Rear Axle Vent Hose (8.6 or 9.5 Inch Ring Gear)
    GM692548Courtesy of GENERAL MOTORS COMPANY
  10. Remove the rear axle vent hose from the rear axle, if necessary.
  11. Remove the vent hose swivel clip from the rear brake crossover pipe, if necessary.
  12. Remove the right rear stabilizer shaft link to frame bolt and nut.
  13. Remove the right rear stabilizer shaft link from the frame.
  14. Remove the right rear shock absorber lower bolt and nut.
  15. Lower the right side of the rear axle using the adjustable jack in order to remove the muffler.
    16. Fig 4: Band Clamp
    GM1936687Courtesy of GENERAL MOTORS COMPANY
  16. Loosen the catalytic converter to muffler clamp bolt (1).
    17. Fig 5: View Of Exhaust System Hangers
    GM1709380Courtesy of GENERAL MOTORS COMPANY
  17. Lubricate the insulators where the muffler assembly hangers are inserted in order to ease in removal.
  18. With the aid of an assistant, remove the insulators from the exhaust system hangers (1, 2, and 3).
    19. Fig 6: View Of Exhaust System Hanger & Insulator
    GM1709383Courtesy of GENERAL MOTORS COMPANY
  19. With the aid of an assistant, remove the insulator from the exhaust system hanger near the resonator.
    20. NOTE:

    During removal, do not over extend the flex coupler as internal damage may occur.

  20. Remove the muffler assembly.
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