Exhaust Manifold Replacement - Left Side 6.0L

1. Remove the engine sight cover. Refer to Upper Intake Manifold Sight Shield Replacement .

Notice: Refer to Excessive Force and Oxygen Sensor Notice in the Preface section.

2. Remove the bank 1, sensor 1 oxygen sensor from the exhaust manifold. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
3. Remove the spark plugs. Refer to Spark Plug Replacement .
4. Remove the generator. Refer to Generator Replacement .



5. Remove the catalytic convertor. Refer to Catalytic Converter Replacement - Left Side .
6. Remove the exhaust manifold bolts.

Important: It may be necessary to remove the heat assembly from the exhaust manifold to gain enough clearance to remove the exhaust manifold.

7. Remove the exhaust manifold.

Important: Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may effect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.

Important: In the following service procedure, position the catalytic convertor on the intermediate pipe, but DO NOT tighten the clamp. Leave it loose to allow the alignment of the exhaust manifold on the cylinder head.

1. Install the catalytic convertor.
2. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953489), or equivalent to the threads of the exhaust manifold bolts.



3. Position the exhaust manifold and a NEW gasket into place.

Notice: Refer to Fastener Notice in the Preface section.

4. Install the exhaust manifold bolts.

Tighten

1. Tighten the exhaust manifold bolts a first pass to 15 N·m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, working toward the outside bolts.
2. Tighten the exhaust manifold bolts a final pass to 25 N·m (18 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, working toward the outside bolts.
5. Install the bank 1, sensor 1 oxygen sensor in the exhaust manifold oxygen sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
6. Install the spark plugs. Refer to Spark Plug Replacement .
7. Install the generator. Refer to Generator Replacement .
8. Install the engine sight cover. Refer to Upper Intake Manifold Sight Shield Replacement .
9. Install the catalytic convertor. Refer to Catalytic Converter Replacement - Left Side .

Exhaust Manifold Replacement - Left Side 7.0L