Exhaust Manifold Replacement. Buick Roadmaster 1996

For 1990-2009 cars

## Exhaust Manifold Replacement Left

### Removal Procedure

1. Disconnect the negative battery cable. Refer to

   Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

   in General Information.
2. Raise the vehicle.
3. Suitably support the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
4. Remove the warm up three way catalytic converter and the gasket from the exhaust manifold. Refer to Warm Up Three Way Catalytic Converter Replacement in Exhaust System.
5. Lower the vehicle.
6. Disconnect the secondary air injection pipe fitting from the exhaust manifold.
7. Remove the exhaust manifold bolts, spacers and stud.
8. Remove the exhaust manifold and the exhaust manifold gasket.
9. Clean the exhaust manifold and cylinder head sealing surfaces.
10. Clean the cylinder head exhaust manifold bolt holes with a 3/8 in 16 NC tap, then flush out the holes with brake cleaner solvent GM P/N 12345754 or equivalent.
11. Clean the exhaust manifold bolts.

### Installation Procedure

Important: The foil side of the gasket must face the manifold.

1. Install the exhaust manifold and gasket.
2. Apply an 8 mm (1/4 in) bead of GM P/N 12345493 adhesive to the bolts and threads.
3. Install the exhaust manifold bolts, spacers and stud.

Tighten
Tighten the exhaust manifold bolts and stud to 40 N·m (30 lb ft).

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.

4. Connect the secondary air injection pipe fitting to the exhaust manifold.

Tighten
Tighten the secondary air injection pipe to 55 N·m (47 lb ft).

5. Raise the vehicle.
6. Suitably support the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
7. Install the warm up three way catalytic converter and gasket to the exhaust manifold. Refer to Warm Up Three Way Catalytic Converter Replacement in Exhaust System.
8. Lower the vehicle.
9. Connect the negative battery cable.

## Exhaust Manifold Replacement Right

### Removal Procedure

1. Disconnect the negative battery cable. Refer to

   Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

   in General Information.
2. Remove the warm up three way catalytic converter and gasket from the exhaust manifold. Refer to Warmup Three Way Catalytic Converter Replacement in Exhaust System.
3. Remove the oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement
4. Remove the secondary air injection pipe fitting from exhaust manifold.
5. Remove the generator rear lower braces. Refer to Generator Replacement in Charging System.
6. Remove the exhaust manifold bolts, studs, and spacers.
7. Remove the exhaust manifold and exhaust manifold gasket.
8. Clean the exhaust manifold and cylinder head sealing surfaces.
9. Clean the cylinder head exhaust manifold bolt holes with a 3/8 in 16 NC tap, then flush out the holes with brake cleaner solvent GM P/N 12345754 or equivalent.
10. Clean the exhaust manifold bolts.

### Installation Procedure

Important: The foil side of the gasket (18) must face the manifold.

1. Install the exhaust manifold and gasket.
2. Apply an 8 mm (1/4 in) band of GM P/N 12345493 adhesive to the bolts and threads.
3. Install the exhaust manifold spacers, studs, and bolts.

Tighten
Tighten the exhaust manifold studs and bolts to 40 N·m (30 lb in).

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.

4. Install the generator rear lower braces. Refer to Generator Brace Replacement in Charging System.
5. Install the oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement .
6. Install the warm up three-way catalytic converter and gasket to the exhaust manifold. Refer to Warmup Three Way Catalytic Converter in Exhaust System.
7. Install the secondary air injection pipe fitting to the exhaust manifold.

Tighten
Tighten the secondary air injection pipe fitting to 55 N·m (41 lb ft).

8. Connect the battery negative cable.