Exhaust Manifold Installation for GMC Truck GMC P42 Commercial Chassis 1998

Exhaust Manifold Installation Left Side

1. Install the NEW exhaust manifold gasket.



2. Install the exhaust manifold.
3. Install the spark plug wire shields.

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. If reusing the fasteners, apply threadlock GM P/N 12345493 or equivalent to the threads of the exhaust manifold bolts and stud.
5. Install the exhaust manifold bolts and stud.

Tighten

1. Tighten the exhaust manifold bolts and stud on the first pass to 15 N·m (11 lb ft).
2. Tighten the exhaust manifold bolts and stud on the final pass to 30 N·m (22 lb ft).
6. Install the spark plug wires to the spark plug wire retainers.
7. Install the spark plug wires onto the spark plugs.

Exhaust Manifold Installation Right Side

1. Install the NEW exhaust manifold gasket.



2. Install the exhaust manifold.
3. Install the spark plug heat shields.

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. If reusing the fasteners, apply threadlock GM P/N 12345493 or equivalent to the threads of the exhaust manifold bolts.
5. Install the exhaust manifold bolts.

Tighten

1. Tighten the exhaust manifold bolts on the first pass to 15 N·m (11 lb ft).
2. Tighten the exhaust manifold bolts on the final pass to 30 N·m (22 lb ft).
6. Install the spark plug wires to the spark plug wire retainers.
7. Install the spark plug wires onto the spark plugs.