Combination Air Bypass/Air Control Valve

Normally Closed, Figures 1 and 2.

1. Disconnect hoses from outlets A and B.

2. Disconnect and plug vacuum line to port D.

3. With engine operating at 1500 rpm air flow should be noted coming out of the bypass vents.

4. Reconnect vacuum line to port D and disconnect and plug vacuum line to port S. Insure vacuum is present in the line to vacuum port D.

5. With engine operating at 1500 rpm air flow should be noted coming out of outlet B (no air flow should be detected at outlet A).

6. Apply 27-34 kPa (8.10 in-Hg) vacuum to port S With engine operating at 1500 rpm, air flow should be noted coming out of outlet A.

7 If the valve is the bleed type, some lesser amount of air will flow from outlet A or B, and the main discharge will change when vacuum is applied to port S.


NOTE: If there is a small air tap attached to the inlet tube from the air pump, air flow should be present during engine operation.