DESCRIPTION
The purpose of the air injection system, is to reduce exhaust emissions by oxidizing Hydrocarbons (HC) and Carbon Monoxide (CO).
The system is composed of air suction valve(s), air cleaner, silencer(s), various hoses and tubing.
OPERATION
Negative pressure from exhaust pulsation reaches suction valve through suction pipe. This causes reeds in suction valve to draw open. Secondary (fresh) air from air cleaner is drawn through silencer(s) and into exhaust passages. (Scheme 7)or (Scheme 8).
When positive pressure is present in exhaust, reeds are closed to prevent reverse flow of exhaust gas.
Scheme 7
Scheme 8
SUCTION VALVE
- Blow air through suction valve air inlet section. Air should flow smoothly through to valve outlet. (Scheme 9) If air does not flow smoothly, reed valve is stuck closed. Replace reed valve.
- Blow air through valve outlet. If air flows out inlet, reed valve is broken or stuck open. Replace reed valve.
- To check suction valve after it has been disassembled, inspect gasket, inlet case and outlet case for damage (cracks). Clean reed valve with gasoline and inspect for waves, cracks or dents in reed valve seat.
- Inspect for a broken or cracked point of reed valve, or a rusty stopper. Replace parts as necessary. (Scheme 10)
