Exhaust Manifold Replacement - Left Side

Exhaust Manifold Replacement - Left Side (V8)

Special Tools

J 42640 Steering Column Anti-Rotation Pin

Removal Procedure





1. Install the J 42640 into the steering column lower access hole.

2. Remove the left wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Left Side (GMC) Front Wheelhouse Liner Replacement - Left Side (Chevrolet) .

3. Fully raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.





4. Remove the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar).

5. Lower the vehicle part way in order to work through the wheel opening.





6. Remove the spark plug wires from the spark plugs.

1. Twist the spark plug wire boot a 1/2 turn.

2. Pull only on the boot in order to remove the wire from the spark plug.

7. Remove the spark plug wires from the ignition coils.

1. Twist the spark plug wire boot a 1/2 turn.

2. Pull only on the boot in order to remove the wire from the ignition coil.





8. Mark the relationship of the upper intermediate steering shaft to the steering column.

9. Remove the steering shaft coupling bolt (2) and nut (1) from the upper intermediate steering shaft.

10. Separate the upper intermediate steering shaft (3) from the steering column, position both shafts out of the way.





11. Remove the exhaust manifold bolts, and exhaust manifold.

12. Remove and discard the exhaust manifold gasket.

13. Remove and discard the catalytic converter seal.





14. If replacing the exhaust manifold, remove the exhaust manifold heat shield bolts, and shield from the exhaust manifold.

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.





Caution:
Refer to Fastener Caution Fastener Caution.

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

Tighten the bolts to 9 Nm (80 lb in).





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.

1. Tighten the bolts a first pass to 15 Nm (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 Nm (18 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. 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 the bolt/nut to 50 Nm (37 lb ft).





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. Install the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar).

Tighten the nuts to 50 Nm (37 lb ft).

17. Partially lower the vehicle.





18. Install the left wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Left Side (GMC) Front Wheelhouse Liner Replacement - Left Side (Chevrolet) .

19. Remove the J 42640 from the steering column lower access hole.