Exhaust Manifold Replacement - Left Side

Exhaust Manifold Replacement - Left Side (LH6/LS2) (5.3L/6.0L)

Removal Procedure




1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
2. Remove the catalytic converter to exhaust manifold nuts (2).
3. Lower the vehicle.
4. Remove the spark plugs. Refer to Spark Plug Replacement (Service and Repair).




5. Remove the exhaust manifold bolts.
6. Remove the exhaust manifold.
7. Remove and discard the exhaust manifold gasket.




8. Remove the exhaust manifold heat shield bolts (604) and shield (603), if required.

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 Diagnostics (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. Position the exhaust manifold heat shield (603) onto the manifold and install the bolts (604), if required.

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




2. Apply a 5 mm (0.2 in) wide band of threadlock to the threads of the exhaust manifold bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers (Specifications).
3. Position a NEW exhaust manifold gasket to the cylinder head.
4. Position the exhaust manifold to the cylinder head and install the studs to the catalytic converter.
5. Install the exhaust manifold bolts.

1. Tighten the bolts a first pass to 15 Nm (11 lb ft). Tighten the 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 (15 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.

6. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
7. Install the spark plugs. Refer to Spark Plug Replacement (Service and Repair).
8. Raise and suitably support the vehicle.




9. Install the catalytic converter to exhaust manifold nuts.

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

10. Lower the vehicle.