LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2017 >> Yukon Denali, RWD >> Repair and Diagnosis >> Engine Mechanical >> Exhaust System >> Repair Instructions >> Three-Way Catalytic Converter Replacement >> Removal Procedure

Removal Procedure

    WARNING:

    Refer to Exhaust Service Warning .

    WARNING:

    Refer to Eye Protection Warning .

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    2. Fig 1: Front U-joint Yoke Retainer Bolts And Front Axle Propeller Shaft
    GM4192514Courtesy of GENERAL MOTORS COMPANY
  2. If equipped with 4WD, remove the front U-joint yoke retainer bolts (1) of the front axle propeller shaft (2) and reposition the propeller shaft. Refer to Front Axle Propeller Shaft Replacement (NQH)Front Axle Propeller Shaft Replacement (Heavy Duty) .
  3. Disconnect the heated oxygen sensor bank 1 sensor 1. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
  4. Disconnect the heated oxygen sensor bank 1 sensor 2. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 .
  5. Disconnect the heated oxygen sensor bank 2 sensor 1. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 .
  6. Disconnect the heated oxygen sensor bank 2 sensor 2. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
  7. Remove the transmission support cross member. Refer to Transmission Support Crossmember Replacement (2WD)Transmission Support Crossmember Replacement (4WD) .
    8. Fig 2: Exhaust Front Pipe
    GM3254773Courtesy of GENERAL MOTORS COMPANY
  8. Loosen the exhaust muffler clamp fastener (1) and detach the exhaust front pipe (2) from the exhaust muffler.
  9. Support the exhaust front pipe (2) with mechanics wire.
    10. Fig 3: Exhaust Front Pipe Right Catalytic Converter Fasteners
    GM3254742Courtesy of GENERAL MOTORS COMPANY
  10. Remove the exhaust front pipe right catalytic converter fasteners (1) and if necessary, remove the exhaust manifold studs (2).
  11. Remove the right catalytic converter (5), from the right exhaust manifold (4), and discard the exhaust manifold seal (3).
    12. Fig 4: Exhaust Front Pipe Left Catalytic Converter Fasteners
    GM3254745Courtesy of GENERAL MOTORS COMPANY
  12. Remove the exhaust front pipe left catalytic converter fasteners (1) and if necessary, remove the left exhaust manifold studs (2).
  13. Remove the left catalytic converter (5), from the left exhaust manifold (4), and discard the exhaust manifold seal (3).
    14. Fig 5: Exhaust Front Pipe
    GM3254773Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If replacing the exhaust front pipe, transfer the heated oxygen sensors to the NEW exhaust front pipe.

  14. Lower the exhaust front pipe (2) to the floor.
scientia non olet · About LEMON Manuals