Exhaust Manifold Replacement - Right
Exhaust Manifold Replacement- RightRemoval Procedure
1. Remove the fuel rail cover.
2. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
3. Remove the exhaust manifold nuts. (left side shown, right side similar)
4. Remove the Connector Position Assurance (CPA) lock.
5. Disconnect the oxygen sensor electrical connector.
Notice: Refer to Oxygen Sensor Notice in Service Precautions.
6. Remove the oxygen sensor.
7. Lower the vehicle.
8. Remove the hose clamp at the right check valve.
9. Remove the secondary air injection (AIR) pipe hose (1) from the right check valve.
10. Loosen, DO NOT remove the AIR pipe bolt at the rear of the left cylinder head.
Important: Do not remove the check valve from the AIR pipe unless valve service is required.
11. Remove the AIR pipe bolts.
12. Reposition the AIR pipe.
13. Remove the old AIR pipe gasket. Discard the gasket
14. Remove the oil level indicator tube.
15. Remove the ignition coil bracket studs.
16. Remove the ignition coil bracket.
17. Remove the spark plugs.
18. Remove the exhaust manifold bolts.
19. Remove the exhaust manifold, and old gasket. Discard the gasket.
20. If necessary, remove the exhaust manifold heat shield bolts and shield.
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 clean and free of debris or threadlocking material.
Notice: Refer to Fastener Notice in Service Precautions.
1. If necessary, install the exhaust manifold heat shield and bolts.
Tighten the exhaust manifold heat shield bolts to 9 Nm (80 inch lbs.).
2. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 or equivalent to the threads of the exhaust manifold bolts.
3. Position the exhaust manifold and a NEW gasket into place.
4. Install the exhaust manifold bolts.
4.1. 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.
4.2. 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.
5. Bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head.
6. Install the ignition coil bracket.
7. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads of the bracket studs.
8. Install the ignition coil bracket studs.
Tighten the ignition coil bracket studs to 12 Nm (106 inch lbs.).
9. Install the spark plugs.
10. Install the oil level indicator tube.
Important: Ensure that the AIR pipe bracket slides behind the bolt at the left cylinder head.
11. Position the AIR pipe (with check valve) and NEW gasket into place.
12. Install the AIR pipe bolts.
Tighten the AIR pipe bolts to 20 Nm (15 ft. lbs.).
13. Tighten the AIR pipe bolt at the rear of the left cylinder head.
Tighten the AIR pipe bolt to 20 Nm (15 ft. lbs.).
14. Install the AIR pipe hose (1) to the right check valve.
15. Install the hose clamp at the right check valve.
16. Raise the vehicle.
17. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the oxygen sensor.
Notice: Refer to Oxygen Sensor Notice in Service Precautions.
18. Install the oxygen sensor.
Tighten the oxygen sensor to 42 Nm (30 ft. lbs.).
19. Connect the oxygen sensor electrical connector.
20. Install the CPA lock.
21. Install the exhaust manifold nuts. (left side shown, right side similar).
Tighten the exhaust manifold nuts to 20 Nm (15 ft. lbs.).
22. Lower the vehicle.
23. Install the fuel rail cover.