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Home › Cadillac › 2012 › Escalade EXT › Repair and Diagnosis › Engine Mechanical › Engine Exhaust System › Repair Instructions › Exhaust Manifold Replacement - Left Side › Installation Procedure

Installation Procedure

NOTE:
  • Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostic (OBD) II system performance.
  • The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
  • Do not apply sealant to the first 3 threads of the bolt.
    Fig 1: View Of Exhaust Manifold Heat Shield & Bolts
    GM1708616Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  1. If the exhaust manifold was replaced, position and install the exhaust manifold heat shield, and bolts to the exhaust manifold.

    Tighten 

    Tighten the bolts to 9 (80 lb in).

    2. Fig 2: View Of Exhaust Manifold, Manifold Bolts & Gasket
    GM1708615Courtesy of GENERAL MOTORS COMPANY
  2. Clean the threads of the exhaust manifold bolts.
  3. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts.
  4. Install a NEW catalytic converter seal to the catalytic converter.
  5. Position the NEW exhaust manifold gasket and exhaust manifold to the cylinder head.
  6. Ensure that the exhaust manifold is seated to the catalytic converter.
  7. Install the exhaust manifold bolts.

    Tighten 

    1. Tighten the bolts a first pass to 15 (11 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
    2. Tighten the bolts a final pass to 20 (15 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
  8. Using a flat punch, bend the gasket tab at the rear of the gasket around the cylinder head edge.
    9. Fig 3: View Of Steering Shaft, Coupling Bolt & Nut
    GM1962341Courtesy of GENERAL MOTORS COMPANY
  9. Position and align the marks on the upper intermediate steering shaft and the steering column.
  10. Install the upper intermediate steering shaft (3) to the steering column.
  11. Install the steering shaft coupling bolt (2) and nut (1) to the upper intermediate steering shaft.

    Tighten 

    Tighten the bolt/nut to 50 (37 lb ft).

    12. Fig 4: View of Spark Plug Wires
    GM1707125Courtesy of GENERAL MOTORS COMPANY
  12. Install the spark plug wires to the spark plugs.
  13. Install the spark plug wires to the ignition coils.
  14. Inspect the spark plug wires for proper installation.
    1. Push sideways on each boot in order to inspect the seating.
    2. Reinstall any loose boot.
  15. Fully raise and support the vehicle.
    16. Fig 5: View Of Exhaust Manifold, Gasket & Catalytic Converter
    GM1708614Courtesy of GENERAL MOTORS COMPANY
  16. Install the catalytic converter to exhaust manifold nuts. (1500 series shown in illustration, 2500 series similar).

    Tighten 

    Tighten the nuts to 50 (37 lb ft).

  17. Partially lower the vehicle.
    18. Fig 6: Locking/Unlocking Steering Column
    GM333146Courtesy of GENERAL MOTORS COMPANY
  18. Install the left wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Left Side .
  19. Remove the J 42640  steering column anti-rotation pin from the steering column lower access hole.
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