Corona L4-2366cc 22R (1982)
1. Disconnect exhaust manifold check valve air hose and air cleaner by-pass hose.
2. Disconnect vacuum hoses from air control valve and air switching valve.
Fig.80 - Testing Air Control Valve
3. With engine idling, apply vacuum directly to air control valve chamber "A" and air switching valve, Fig. 80.
4. Disconnect then reconnect vacuum hose from air by-pass valve. Compressed air should be momentarily discharged from air by-pass hose.
Fig.81 - Testing Air Control Valve
5. Release vacuum from air control valve chamber "A" and apply vacuum directly to air control valve chamber "B" and air switching valve, Fig. 81.
Compressed air should be discharged from by-pass hose at idle.
Fig.82 - Testing Air Control Valve
6. Release vacuum from air control valve chamber "B" and air switching valve, then apply vacuum directly to air control valve chamber "A", Fig. 82.
Compressed air should be discharged from by-pass hose at idle.
7. Connect suitable air pump tester to check valve air hose.
8. Apply vacuum directly to air control valve chamber "A" and air switching valve.
9. Close off tester orifice.
10. Gradually increase engine speed and measure relief valve opening pressure. Opening pressure should be 3.3 to 5.6 psi.
11. Remove tester and reconnect air and vacuum hoses to proper locations.
1981-82 3T-C Engine
1. Disconnect air hose from check valve and air by-pass hose from air cleaner.
2. Disconnect vacuum hoses from air control and air switching valves.
