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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement >> Installation Procedure
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Installation Procedure

    Fig 1: View Of Exhaust System
    GM1215598Courtesy of GENERAL MOTORS COMPANY
  1. While the exhaust system is on the floor complete the following:
    1. Apply a soapy solution to the following in order to ease the installation of the hangers:
      • The inner diameter of the front exhaust hangers
      • The exhaust pipe hanger rods
      • The inner diameter of the tail pipe hangers
      • The tail pipe hanger rods
    2. Press the front exhaust hangers over the exhaust pipe hanger rods.
  2. Place NEW seals on the exhaust manifold flanges.
    3. CAUTION:

    Refer to Exhaust System Inspection Caution .

  3. 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 exhaust manifolds.
  4. Finger tighten the nuts to the exhaust manifold studs.
    5. Fig 2: Locating Tail Pipe Hangers
    GM772379Courtesy of GENERAL MOTORS COMPANY
  5. Press the tail pipe hangers (1) over the tail pipe hanger rods.
    6. Fig 3: Locating Front Exhaust Hangers
    GM772376Courtesy of GENERAL MOTORS COMPANY
  6. Press the front exhaust hangers (1) over the rear suspension hanger rods.
    7. Fig 4: View Of Exhaust Pipe-To-Exhaust Manifold Nuts
    GM772367Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  7. Tighten the exhaust pipes to exhaust manifold nuts to 17 N.m (13 lb ft).
    8. Fig 5: Floorpan Brace
    GM772383Courtesy of GENERAL MOTORS COMPANY
  8. Position the floor panel tunnel brace to the floor panel.
  9. Install the 2 bolts securing the floor panel tunnel brace to the floor panel and tighten to 25 N.m (18 lb ft).
  10. Install the heated oxygen sensors to the exhaust pipes. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 , and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
  11. Lower the vehicle.
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