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Home >> Cadillac >> 2003 >> CTS Automatic >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement >> Installation Procedure
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Installation Procedure

  1. While the exhaust system is on the floor complete the following:
    1. 1.1 Apply a soapy solution to the following in order to ease the installation of the hangers:
      • The inner diameter of the front exhaust hanger (2)
      • The exhaust pipe hanger rod (3)
      • The inner diameter of the tail pipe hangers
      • The tail pipe hanger rods (1)
    2. 1.2 Press the front exhaust hanger (2) over the exhaust pipe hanger rod (3).
      Fig 1: Installing Exhaust Hanger
      G02087406Courtesy of GENERAL MOTORS CORP.
  2. Place a NEW seal on the left catalytic converter flange.
  3. Place a NEW gasket over the right catalytic converter studs.
    NOTE: Refer to EXHAUST SYSTEM INSPECTION NOTICE in Cautions and Notices.
    NOTE: Refer to FLEX DECOUPLER NOTICE in Cautions and Notices.
  4. With the aid of an assistant, raise the exhaust system into position, aligning the exhaust pipe flanges with the studs located in the rear of the catalytic converters.
  5. Finger tighten the 4 nuts to the catalytic converter studs.
    Fig 2: Installing Exhaust System
    G02087407Courtesy of GENERAL MOTORS CORP.
  6. Press the tail pipe hangers (1) over the tail pipe hanger rods.
    Fig 3: Installing Tail Pipe Hangers Rods
    G02087408Courtesy of GENERAL MOTORS CORP.
  7. Press the front exhaust hanger (1) over the rear suspension hanger rod.
    Fig 4: Installing Front Exhaust Hanger
    G02087409Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  8. Tighten the 2 left catalytic converter nuts previously installed in step 5.

    Tighten 

    Tighten the catalytic converter nuts to 15 N.m (11 lb ft).

    Fig 5: Installing Left Catalytic Converter & Retaining Nuts
    G02087410Courtesy of GENERAL MOTORS CORP.
  9. Tighten the 2 right catalytic converter nuts previously installed in step 5.

    Tighten 

    Tighten the catalytic converter nuts to 15 N.m (11 lb ft).

    Fig 6: Installing Right Catalytic Converter & Retaining Nuts
    G02087411Courtesy of GENERAL MOTORS CORP.
  10. Position the floor panel tunnel brace to the floor panel.
  11. Install the 2 bolts securing the floor panel tunnel brace to the floor panel.

    Tighten 

    Tighten the floor panel tunnel brace bolts to 25 N.m (18 lb ft).

    Fig 7: Installing Floor Panel Tunnel Brace & Bolts
    G02087412Courtesy of GENERAL MOTORS CORP.
  12. Lower the vehicle.
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