Exhaust Manifold Replacement - Left Side LH6/LS2

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



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.

Note: 

Caution: Refer to Fastener Caution in the Preface section.




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

Tighten
Tighten the bolts to 9 N·m (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.
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.

Tighten

1. Tighten the bolts a first pass to 15 N·m (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 N·m (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.
8. Raise and suitably support the vehicle.



9. Install the catalytic converter to exhaust manifold nuts.

Tighten
Tighten the nuts to 50 N·m (37 lb ft).

10. Lower the vehicle.