Exhaust Manifold Replacement - Left

Exhaust Manifold Replacement - Left

Removal Procedure
1. Remove the engine sight cover.

2. Notice: Refer to in Service Precautions.

Remove the Bank 1, Sensor 1 oxygen sensor from the exhaust manifold.
3. Remove the spark plugs.
4. Remove the generator, if needed.
5. Raise the vehicle. Refer to Vehicle Lifting.





6. Remove the catalytic convertor.
7. Lower the vehicle.
8. Remove the exhaust manifold bolts.

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

Remove the exhaust manifold.

Installation Procedure

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.

The cylinder head exhaust manifold bolt hole threads must be cleaned and free of debris or threadlocking material.
1. Raise the vehicle.

2. 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.

Install the catalytic convertor.
3. Lower the vehicle.
4. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953489), or equivalent to the threads of the exhaust manifold bolts.





5. Position the exhaust manifold and a NEW gasket into place.
6. Install the exhaust manifold bolts.
1. Tighten the exhaust manifold bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, working toward the outside bolts.
2. Tighten the exhaust manifold bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, working toward the outside bolts.
7. Install the Bank 1, Sensor 1 oxygen sensor in the exhaust manifold oxygen sensor.
8. Install the spark plugs.
9. Install the generator.
10. Install the engine sight cover.
11. Raise the vehicle.
12. Install the catalytic convertor to exhaust manifold nuts.
Tighten the exhaust manifold nuts to 20 Nm (15 ft. lbs.).
13. Tighten the exhaust clamps for the catalytic convertor.
Tighten the exhaust clamps for the catalytic convertor bolt to 20 Nm (15 ft. lbs.).
14. Lower the vehicle.