Air Injection: Service and Repair

AIR INJECTION PUMP, REPLACE

1. Disconnect air inlet and outlet hoses from air pump.
2. Remove drive belt and mounting bolts from pump and remove the pump.
3. Reverse procedure to install.

CHECK VALVE, REPLACE

1. Disconnect air supply valve from hose and, using a 1.25 inch crow-foot wrench, remove check valve.
2. Clean threads on air manifold adapter using a wire brush, then install new check valve.

AIR BYPASS VALVE, REPLACE

1. Disconnect air and vacuum hoses from valve, then remove the valve.
2. Reverse procedure to install.

AIR MANIFOLD, REPLACE

1. Disconnect air supply hose from check valve and position hose aside.
2. Unscrew air manifold to cylinder head coupling nuts until free of the cylinder head, then remove air manifold.
3. Reverse procedure to install.

AIR SUPPLY TUBES, REPLACE

The air supply tubes, or air nozzles, will normally be replaced during cylinder head overhaul, however, they may be replaced without removing the cylinder head by removing the air manifolds and using a hooked tool to pull the tube.