Exhaust Manifold Installation Left

1. With the manifold still on the bench, position a new manifold gasket in place on the manifold sealing surface.
2. Install two outer manifold bolts in the manifold to retain the gasket.
3. Using two hands, position the manifold and gasket onto the cylinder head.
4. Hand tighten the two outer manifold bolts.
5. Install the remaining manifold retaining bolts.

Tighten
Tighten the exhaust manifold retaining bolts to 24 N·m (18 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.




6. Insert the end of the oil level indicator tube in the cylinder block. Align the mounting tab with the mounting bolt hole.
7. Install the oil level tube retaining bolt.

Tighten
Tighten the oil level tube retaining bolt to 10 N·m (89 lb ft).

8. Install the oil level indicator.



9. Position the exhaust crossover pipe (1) in the left exhaust manifold (3) flange.
10. Install new manifold flange bolts for maximum joint integrity. Hand tighten. Do not torque the flange bolts to specification until the engine is mounted in the vehicle.
11. Coat the oxygen sensor threads with high temperature anti-seize, GM P/N 5613695, or equivalent.
12. Install the oxygen sensor.

Tighten
Tighten the oxygen sensor to 40 N·m (30 lb ft).

13. Install the crossover retaining bolts at the cylinder head and lower crankcase.

Tighten
Tighten the crossover-to-cylinder head retaining bolt to 25 N·m (18 lb ft).

Tighten
Tighten the crossover-to-lower crankcase retaining bolt to 30 N·m (22 lb ft).

14. Install the EGR feed tube to the crossover pipe.

Tighten
Tighten the EGR feed tube-to-crossover pipe nut to 60 N·m (44 lb ft).

Exhaust Manifold Installation Right

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.

1. If the engine is equipped with coolant heaters, install the right side (1) heater as follows:

1.1.	Place the coolant heater (1) in position on the cylinder block.

1.2.	Install the coolant heater bolt.

Tighten
Tighten the coolant heater bolt to 10 N·m (89 lb in).




2. Position a new manifold gasket (1) in place on the cylinder head studs.
3. Using two hands, position the manifold (2) onto the cylinder head.
4. Install two outer manifold nuts (3) to hold the manifold in place.
5. Install the remaining manifold nuts.

Tighten
Tighten the exhaust manifold nuts (3) to 25 N·m (18 lb ft).




6. Coat the oxygen sensor threads with high temperature anti-seize, GM P/N 5613695 or equivalent.
7. Install the oxygen sensor (1).

Tighten
Tighten the oxygen sensor to 40 N·m (30 lb ft).