Air Guard System: Operation: Notes

Fresh air is drawn into the air pump through a filter fan. The air is compressed in the pump and then discharged through the pump to the diverter valve which directs it to the air distribution system or dumps it through a bypass port, depending on engine operating conditions. Air pressure in this system is maintained at approximately 5 psi by a relief valve incorporated in the diverter valve.

Air from the diverter valve is directed through the air injection mounted check valve. At each exhaust port, a hollow fitting carries air into the exhaust manifold. The air mixes with hot exhaust gases and causes a further burning of the mixture, reducing hydrocarbon and carbon monoxide emissions.