For 1990-2009 cars

## Exhaust Manifold Replacement RH Side

### Removal Procedure

1. Remove the transmission. Refer to Transmission Replacement in Automatic Transmission.
2. Remove the coolant intake pipe. Refer to Engine Coolant Inlet Pipe Replacement in Engine Cooling.
3. Remove the three exhaust manifold lower heat shield bolts.
4. Remove the exhaust manifold lower heat shield.
5. Remove the three lower nuts on the rear of the exhaust manifold.
6. Remove the rear, upper heat shield bolt.
7. Remove the catalytic converter nuts from the exhaust manifold.
8. Lower the vehicle.
9. Remove the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
10. Remove the two nuts on the front of the exhaust manifold.
11. Remove the exhaust manifold upper heat shield bolts. The upper heat shield stays in place. The bolts are removed to enable access to the AIR pipe.
12. Remove the AIR pipe bolts (1).
13. Remove the AIR pipe (2) from the exhaust manifold.
14. Remove the two upper nuts on the exhaust manifold.
15. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
16. Remove the exhaust manifold from under the vehicle.
17. Clean the cylinder head mating surfaces.
18. Clean the exhaust manifold mating surfaces if being reused.

### Installation Procedure

1. Install the exhaust manifold and hold in place with the manifold nuts that are most easily accessible.
2. Lower the vehicle.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the two upper nuts to the exhaust manifold.

Tighten
Tighten the exhaust manifold nuts to 20 N·m (15 lb ft).

4. Install the AIR pipe (2) to the exhaust manifold.
5. Coat the AIR pipe bolts (1) with high temperature anti-seize compound, GM P/N 5613695 or equivalent.
6. Install the AIR pipe bolts (1).

Tighten
Tighten the AIR injection pipe bolts to 20 N·m (15 lb ft).

7. Coat the exhaust manifold upper heat shield bolts with high temperature anti-seize compound, GM P/N 5613695 or equivalent.
8. Install the exhaust manifold upper heat shield bolts.

Tighten
Tighten the exhaust manifold upper heat shield bolts to 8 N·m (71 lb in).

9. Install the two lower nuts to the front of the exhaust manifold.

Tighten
Tighten the exhaust manifold nuts to 20 N·m (15 lb ft).

10. Install the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
11. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
12. Install the catalytic converter nuts to the exhaust manifold.

Tighten
Evenly tighten the catalytic converter nuts to 20 N·m (15 lb ft).

13. Install the three lower nuts to the rear of the exhaust manifold.

Tighten
Tighten the exhaust manifold nuts to 20 N·m (15 lb ft).

14. Install the exhaust manifold lower heat shield.
15. Coat the exhaust manifold lower heat shield bolts with high temperature anti-seize compound, GM P/N 5613695 or equivalent.
16. Install the exhaust manifold lower heat shield bolts.

Tighten
Tighten the exhaust manifold lower heat shield bolts to 8 N·m (71 lb in).

17. Lower the vehicle.
18. Install the coolant intake pipe. Refer to Engine Coolant Inlet Pipe Replacement in Engine Cooling.
19. Install the transmission. Refer to Transmission Replacement in Automatic Transmission.

## Exhaust Manifold Replacement LH Side

### Removal Procedure

1. Remove the engine assembly. Refer to Engine Replacement .
2. Remove the exhaust manifold lower heat shield bolts.
3. Remove the exhaust manifold lower heat shield.
4. Remove the exhaust manifold upper heat shield bolts.
5. Remove the exhaust manifold upper heat shield.
6. Remove the AIR pipe bolts (1).
7. Remove the AIR pipe (2) from the exhaust manifold.
8. Remove the coolant pipe (3) and the engine lift bracket bolt (2) from the cylinder head.
9. Grasp the oil level indicator tube (4) firmly.
10. Pull the oil level indicator tube upwards for removal.
11. Remove the exhaust manifold nuts.
12. Remove the exhaust manifold.
13. Clean the cylinder head mating surfaces.
14. Clean the exhaust manifold mating surfaces if being reused.

### Installation Procedure

1. Install the exhaust manifold.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the exhaust manifold nuts.

Tighten
Tighten the exhaust manifold nuts to 20 N·m (15 lb ft).

3. Install the oil level indicator tube (4).
4. Install the coolant pipe (3) and the engine lift bracket bolt (2) to the cylinder head. Ensure the bolt (2) passes through all of the attached components.

Tighten
Tighten the coolant pipe/engine lift bracket bolt (2) to 20 N·m (15 lb ft).

5. Install the AIR pipe to the exhaust manifold.
6. Coat the AIR pipe bolts with high temperature anti-seize compound, GM P/N 5613695 or equivalent.
7. Install the AIR pipe bolts (1).

Tighten
Tighten the AIR injection pipe bolts to 20 N·m (15 lb ft).

8. Install the exhaust manifold upper heat shield.
9. Coat the exhaust manifold upper heat shield bolts with high temperature anti-seize compound, GM P/N 5613695 or equivalent.
10. Install the exhaust manifold upper heat shield bolts.

Tighten
Tighten the exhaust manifold upper heat shield bolts to 8 N·m (71 lb in).

11. Install the exhaust manifold lower heat shield.
12. Coat the exhaust manifold lower heat shield bolts with high temperature anti-seize compound, GM P/N 5613695 or equivalent.
13. Install the exhaust manifold lower heat shield bolts.

Tighten
Tighten the heat shield bolts to 8 N·m (71 lb in).

14. Install the engine assembly. Refer to Engine Replacement .