Air Injection System - BRITISH LEYLAND: Operation: Notes
Air is pressure fed from the air pump through a one-way check valve into the injection manifold. The check valve protects the pump from a back-flow of exhaust gases should the exhaust pressure exceed the pump pressure due to pump drive failure or exhaust system restriction. The compressed air passes through the air injection manifold into the exhaust port of each cylinder (in the vicinity of the exhaust valve) at which point exhaust gases are still hot enough to be further oxidized.
NOTE:
Efficient operation of this system is dependent on the engine being correctly tuned. Ignition and spark plug settings, valve clearances, and carburetor adjustments given for a particular engine must be strictly adhered to at all times.