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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 47 (Exhaust System) >> Repair Instructions >> Exhaust Front Underbody Heat Shield Replacement - Left Side (LF4) >> Installation Procedure

Installation Procedure

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  1. GM5872900Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Underbody Heat Shield (3) - Install

    2. CAUTION:

    Refer to Component Fastener Tightening Caution .

  2. Exhaust Heat Shield Bolt (2) - Install and tighten - Fastener Specifications 
  3. Exhaust Heat Shield Nut (1) - Install and tighten [3x] - Fastener Specifications 
  4. GM5872277Courtesy of GENERAL MOTORS COMPANY

    Turbocharger Exhaust Pipe Gasket (2) - Install NEW

  5. Warm Up Three-Way Catalytic Converter (1) - Install
  6. GM5872256Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Nut (1) - Install and tighten [4x] - Fastener Specifications 

  7. GM5786728Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before reinstallation. Adhesives, Fluids, Lubricants, and Sealers

    Install and tighten the heated oxygen sensor (1) using a suitable tool. Fastener Specifications

  8. Connect the heated oxygen sensor electrical connector.
  9. GM5786732Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before reinstallation. Adhesives, Fluids, Lubricants, and Sealers

    Install and tighten the heated oxygen sensor (1) using a suitable tool. Fastener Specifications

  10. Connect the heated oxygen sensor electrical connector.
  11. GM5867464Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Brace (2) - Install

  12. Catalytic Converter Brace Bracket Nut (1) - Install and tighten [5x] - Fastener Specifications 
  13. GM5865329Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Gasket (2) - Install NEW

  14. With the aid of an assistant, install the exhaust muffler (1).
  15. GM5865300Courtesy of GENERAL MOTORS COMPANY

    Exhaust Muffler Hanger Bracket Nut (1) - Install and tighten [4x] - Fastener Specifications 

  16. GM5865293Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) - Connect

  17. GM5865287Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) - Connect

  18. GM5406632Courtesy of GENERAL MOTORS COMPANY

    Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Right Side (2) - Install [2x]

  19. GM5406578Courtesy of GENERAL MOTORS COMPANY

    Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Left Side (2) - Install [2x]

  20. GM5865271Courtesy of GENERAL MOTORS COMPANY

    Exhaust Pipe Clamp (1) - Tighten [2x] - Fastener Specifications 

  21. GM5865265Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Nut (1) - Install and tighten [2x] - Fastener Specifications 

  22. GM5400756Courtesy of GENERAL MOTORS COMPANY

    Floor Panel Reinforcement (2) - Install

  23. Floor Panel Number 4 Cross Bar Reinforcement Bolt (1) - Install and tighten [6x] - Fastener Specifications
  24. GM5854893Courtesy of GENERAL MOTORS COMPANY

    Underbody Front Air Deflector- Left Side (5) - Install

  25. Transmission Fluid Cooler Pipe Bracket Bolt- Left Side (3) - Install and tighten [2x] - Fastener Specifications
  26. Underbody Front Air Deflector Nut- Left Side (2) - Install and tighten [5x] - Fastener Specifications
  27. Underbody Front Air Deflector Bolt- Left Side (1) - Install and tighten [6x] - Fastener Specifications
  28. GM5400642Courtesy of GENERAL MOTORS COMPANY

    Underbody Rear Air Deflector- Right Side (5) - Install

  29. Underbody Rear Air Deflector Nut- Right Side (3) - Install and tighten [3x] - Fastener Specifications
  30. Underbody Rear Air Deflector Bolt- Right Side (2) - Install and tighten [3x] - Fastener Specifications
  31. Underbody Rear Air Deflector Nut- Right Side (4) - Install and tighten [2x] - Fastener Specifications
  32. Rear Wheelhouse Liner Bolt- Right Side (1) - Install and tighten - Fastener Specifications
  33. GM5400553Courtesy of GENERAL MOTORS COMPANY

    Underbody Rear Air Deflector- Left Side (5) - Install

  34. Underbody Rear Air Deflector Nut- Left Side (2) - Install and tighten [3x] - Fastener Specifications
  35. Underbody Rear Air Deflector Bolt- Left Side (3) - Install and tighten [3x] - Fastener Specifications
  36. Underbody Rear Air Deflector Nut- Left Side (4) - Install and tighten [2x] - Fastener Specifications
  37. Rear Wheelhouse Liner Bolt- Left Side (1) - Install and tighten - Fastener Specifications
  38. GM5395705Courtesy of GENERAL MOTORS COMPANY

    Rear Tire Front Air Deflector- Left Side and Right Side (2) - Install [2x]

  39. Rear Tire Front Air Deflector Bolt- Left Side and Right Side (1) - Install and tighten [4x] - Fastener Specifications
  40. Lower the vehicle.
  41. Inspect the exhaust system for leaks.
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