For 1990-2009 cars

## Exhaust Manifold Replacement - Right Side LH8

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Remove the catalytic converter. Refer to Catalytic Converter Replacement - Right Side.
3. Remove the spark plugs. Refer to Spark Plug Replacement.
4. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Right Side.
5. Remove the oil level indicator and tube. Refer to Oil Level Indicator Tube Replacement.
6. Remove the exhaust manifold bolts (3).
7. Remove the exhaust manifold (2) and gasket (1). Discard the gasket.

### Installation Procedure

Note:

• | Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect 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.

Note: Do not apply sealant to the first 3 threads of the bolt.

1. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493, (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts.
2. Ensure that the exhaust seal is still seated on the catalytic converter recess.
3. Install one exhaust manifold bolt to the exhaust manifold (2) and place the NEW gasket (1) onto the bolt.
4. Install the exhaust manifold to the catalytic converter flange and position the manifold to the cylinder head.
5. Install the oil level indicator and tube. Refer to Oil Level Indicator Tube Replacement.

Caution: Refer to Fastener Caution in the Preface section.

6. Install the remaining exhaust manifold bolts (3).

Tighten

1. Tighten the bolts a first pass to 15 N·m (11 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
2. Tighten the bolts a final pass to 25 N·m (18 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.

7. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head.
8. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side.
9. Install the spark plugs. Refer to Spark Plug Replacement.

Note: The manifold is removed below the vehicle.

10. Install the catalytic converter. Refer to Catalytic Converter Replacement - Right Side.

Tighten
Tighten the nuts to 50 N·m (37 lb ft).

11. Lower the vehicle.