For 1990-2009 cars

## Exhaust Manifold Replacement - Left Side 6.0L Engine - HSV Maloo

### Removal Procedure -- LS2

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

1. Disconnect the battery ground cable from the battery. Refer to Battery Negative Cable Disconnection and Connection.
2. Remove the engine dress cover. Refer to Engine Cover Replacement.
3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
4. Remove the left side spark plug leads. Refer to Spark Plug Wire Replacement.
5. Remove the left side spark plugs from the cylinder head. Refer to Spark Plug Replacement.
6. Remove the left side catalytic converter. Refer to Catalytic Converter Replacement - Left Side.
7. Remove the engine coolant temperature sensor. Refer to Engine Coolant Temperature Sensor Replacement.
8. Loosen the exhaust manifold to cylinder head retaining bolts (1) working from the outside to the centre.

Important: Bolts with micro-encapsulated thread sealant must be discarded after removal.

9. Remove the exhaust manifold to cylinder head retaining bolts (1).

Discard the bolts.

Important: Make sure that the surrounding wiring harness and electrical connectors are not damaged when removing the exhaust manifold (2).

Important: The exhaust manifold gasket (1) and sealing ring (3) are single use parts. They must be discarded after removal.

Important: The left hand exhaust manifold can only be removed from underneath the vehicle.

10. Remove the exhaust manifold (2).

Discard the exhaust manifold gasket (1) and sealing ring (3).

### Installation Procedure -- LS2

#### Inspect

Notice: Refer to Exhaust Service Caution in the Preface section.

1. Before installation inspect for the following:

• | Damage to the gasket sealing surfaces.

• | Distortion of exhaust manifold mating surface.

• | Damage to the exhaust mounting holes.

2. Check for distortion on the mating surface of the exhaust manifold (1) by using a straight edge (2) and a feeler gauge (3).
3. Clean the exhaust manifold and catalytic converter flange mating surfaces.
4. Install a NEW exhaust manifold gasket (1) and NEW sealing ring (3) to the exhaust manifold (2).

Notice: Refer to Exhaust System Inspection Notice in the Preface section.

5. Install the exhaust manifold assembly (2) to the engine.

Important: Do not fully tighten the exhaust manifold to cylinder head retaining bolts (1) at this stage.

6. Install the NEW exhaust manifold to cylinder head retaining bolts (1).

Do not fully tighten at this stage.

7. Clean the threads of the exhaust manifold to catalytic converter retaining studs with a suitable cleaning solvent.

Important: Make sure the sealing ring is seated correctly.

8. Install the left side catalytic converter. Refer to Catalytic Converter Replacement - Left Side.
9. Tighten the exhaust manifold to cylinder head retaining bolts (1) working from the centre to the outside.

Tighten
Tighten the bolts to 20 Nm (15 lb ft).

10. Install the engine coolant temperature sensor. Refer to Engine Coolant Temperature Sensor Replacement.
11. Install the left side spark plugs to the cylinder head. Refer to Spark Plug Replacement.
12. Install the left side spark plug leads. Refer to Spark Plug Wire Replacement.
13. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
14. Perform diagnostic system check using diagnostic scan tool, clear all relative DTC's and inspect the system for correct operation.
15. Install the engine dress cover. Refer to Engine Cover Replacement.
16. Connect the battery ground cable to the battery. Refer to Battery Negative Cable Disconnection and Connection.

## Exhaust Manifold Replacement - Left Side 6.0L Engine - Except HSV Maloo

### Removal Procedure

1. Disconnect the battery ground cable from the battery. Refer to Battery Negative Cable Disconnection and Connection .
2. Remove the engine dress cover. Refer to Engine Cover Replacement .
3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
4. Remove the left side spark plug leads. Refer to Spark Plug Wire Replacement .
5. Remove the left side spark plugs from the cylinder head. Refer to Spark Plug Replacement .

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

6. Remove the exhaust manifold heat shield to exhaust manifold retaining bolts (2).
7. Remove the exhaust manifold heat shield (1).
8. Remove the engine coolant temperature sensor. Refer to Engine Coolant Temperature Sensor Replacement .

Important: The left catalytic converter to exhaust manifold retaining nuts (2) are single use parts. They must be discarded after removal.

9. Remove the left catalytic converter to exhaust manifold retaining nuts (2).

Discard the nuts.

10. Disconnect the left catalytic converter (3) from the exhaust manifold (4).
11. Loosen the exhaust manifold to cylinder head retaining bolts (1) working from the outside to the centre.

Important: Bolts with micro-encapsulated thread sealant must be discarded after removal.

12. Remove the exhaust manifold to cylinder head retaining bolts (1).

Discard the bolts.

Important: Make sure that the surrounding wiring harness and electrical connectors are not damaged when removing the exhaust manifold (2).

Important: The exhaust manifold gasket (1) and sealing ring (3) are single use parts. They must be discarded after removal.

13. Remove the exhaust manifold (2).

Discard the exhaust manifold gasket (1) and sealing ring (3).

### Installation Procedure

#### Inspect

Notice: Refer to Exhaust Service Caution in the Preface section.

1. Before installation inspect for the following:

• | Damage to the gasket sealing surfaces.

• | Distortion of exhaust manifold mating surface.

• | Damage to the exhaust mounting holes.

2. Check for distortion on the mating surface of the exhaust manifold (3) by using a straight edge (1) and a feeler gauge (2).
3. Clean the exhaust manifold and catalytic converter flange mating surfaces.
4. Install a NEW exhaust manifold gasket (1) and NEW sealing ring (3) to the exhaust manifold (2).

Notice: Refer to Exhaust System Inspection Notice in the Preface section.

5. Install the exhaust manifold assembly to the engine.

Important: Do not fully tighten the exhaust manifold to cylinder head retaining bolts (1) at this stage.

6. Install the NEW exhaust manifold to cylinder head retaining bolts (1).

Do not fully tighten at this stage.

Important: Make sure the sealing ring is seated correctly.

7. Lift the left catalytic converter (3) up and forward to connect to the exhaust manifold (4).
8. Clean the threads of the exhaust manifold to catalytic converter retaining studs with a suitable cleaning solvent.

Notice: Refer to Fastener Notice in the Preface section.

9. Install the NEW left catalytic converter to exhaust manifold retaining nuts (2).

Tighten
Tighten the nuts to 45 N·m (33 lb ft).

10. Tighten the exhaust manifold to cylinder head retaining bolts (1) working from the centre to the outside.

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

11. Install the engine coolant temperature sensor. Refer to Engine Coolant Temperature Sensor Replacement .
12. Install the exhaust manifold heat shield (1).
13. Install the exhaust manifold heat shield to exhaust manifold retaining bolts (2).

Tighten
Tighten the bolts to 10 N·m (89 lb in).

14. Install the left side spark plugs to the cylinder head. Refer to Spark Plug Replacement .
15. Install the left side spark plug leads. Refer to Spark Plug Wire Replacement .
16. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
17. Install the engine dress cover. Refer to Engine Cover Replacement .
18. Connect the battery ground cable to the battery. Refer to Battery Negative Cable Disconnection and Connection .

## Exhaust Manifold Replacement - Left Side 3.6L Engine

### Removal Procedure

1. Disconnect the battery ground cable from the battery. Refer to Battery Negative Cable Disconnection and Connection .
2. Remove the engine dress cover. Refer to Engine Cover Replacement .

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

3. Remove the exhaust manifold heat shield to exhaust manifold retaining bolts (1).
4. Remove the exhaust manifold heat shield (2).
5. Remove the oil level indicator tube. Refer to Oil Level Indicator and Tube Removal .

Important: The left catalytic converter to exhaust manifold retaining nuts (2) are single use parts. They must be discarded after removal.

6. Remove the left catalytic converter to exhaust manifold retaining nuts (2).

Discard the nuts.

Caution: Refer to Vehicle Lifting Caution in the Preface section.

7. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
8. Remove the left catalytic converter. Refer to Catalytic Converter Replacement - Left Side .
9. Remove the starter motor. Refer to Starter Motor Replacement .
10. Lower the vehicle.
11. Loosen the exhaust manifold to cylinder head retaining bolts (1) working from the outside to the centre.

Important: Bolts with micro-encapsulated thread sealant must be discarded after removal.

12. Remove the exhaust manifold to cylinder head retaining bolts (1).

Discard the bolts.

13. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

Important: Make sure that the surrounding wiring harness and electrical connectors are not damaged when removing the exhaust manifold (2).

Important: The exhaust manifold gasket (1) and sealing ring (3) are single use parts. They must be discarded after removal.

14. Remove the exhaust manifold (2).

Discard the exhaust manifold gasket (1) and sealing ring (3).

### Installation Procedure

Notice: Refer to Exhaust Service Caution in the Preface section.

1. Before installation inspect for the following:

• | Damage to the gasket sealing surfaces.

• | Distortion of exhaust manifold mating surface.

• | Damage to the exhaust mounting holes.

2. Check for distortion on the mating surface of the exhaust manifold (2) by using a straight edge (1) and a feeler gauge (3).
3. Clean the exhaust manifold and catalytic converter flange mating surfaces.
4. Install a NEW exhaust manifold gasket (1) and NEW sealing ring (3) to the exhaust manifold (2).

Notice: Refer to Exhaust System Inspection Notice in the Preface section.

5. Install the exhaust manifold assembly to the engine.
6. Lower the vehicle.

Important: Do not fully tighten the exhaust manifold to cylinder head retaining bolts (1) at this stage.

7. Install the NEW exhaust manifold to cylinder head retaining bolts (1).

Do not fully tighten at this stage.

Important: Make sure the sealing ring is seated correctly.

8. Install the left catalytic converter. Refer to Catalytic Converter Replacement - Left Side .
9. Install the starter motor. Refer to Starter Motor Replacement .

Notice: Refer to Fastener Notice in the Preface section.

10. Install the NEW left catalytic converter to exhaust manifold retaining nuts (2).

Tighten
Tighten the nuts to 45 N·m (33 lb ft).

11. Tighten the exhaust manifold to cylinder head retaining bolts (1) working from the centre to the outside.

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

12. Install the exhaust manifold heat shield (2).
13. Install the exhaust manifold heat shield to exhaust manifold retaining bolts (1).

Tighten
Tighten the bolts to 10 N·m (89 lb in).

14. Install the engine dress cover. Refer to Engine Cover Replacement .
15. Connect the battery ground cable to the battery. Refer to Battery Negative Cable Disconnection and Connection .