Air Injection Check Valve: Service and Repair

REMOVAL PROCEDURE
1. Remove the AIR hose clamps.
2. Remove the AIR hoses.
3. Remove the AIR check valve (3) from the center AIR pipe (4).
4. Remove the center AIR pipe (4).
5. Remove the upper exhaust manifold heat shield.
6. Remove the bolts in the AIR pipe.
7. Remove the AIR pipe from the exhaust manifold.
^ Air pipe bank 1 (1)
^ Air pipe bank 2 (2)

INSTALLATION PROCEDURE
1. Install the AIR pipe gaskets on the new AIR pipes.

IMPORTANT: Before installing the AIR pipes, clean the surface of the exhaust manifold to ensure tight seal. Use an anti-seize compound GM P/N 5613695 or equivalent on the AIR pipe nipple to manifold, the bolts, and the AIR check valve.

2. Install the AIR pipes to the exhaust manifolds on the following:
^ AIR pipe bank 1 (1)
^ AIR pipe bank 2 (2)

3. Install the bolts into the AIR pipes.

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

4. Install the upper exhaust manifold heat shields.
5. Install the center AIR pipe (4).
6. Install the AIR check valve (3).

Tighten
Tighten the AIR check valve to 30 N.m (22 lb ft).

7. Connect the AIR hoses.
8. Install the AIR hose clamps.
9. Check for air leaks.