Primary Vacuum Break

Fig. 12 Primary vacuum break adjustment:

1. Attach rubber band to intermediate choke shaft to hold choke valve closed.
2. Install angle gauge and set angle to specifications.
3. Using outside vacuum source, retract vacuum break plunger with a minimum of 18 inches Hg of vacuum.
4. Ensure that air valve rod does not restrict plunger from full retraction. If necessary, bend rod as shown to permit full plunger travel, Fig. 12.
5. Make adjustment with vacuum still applied by rotating adjusting screw with a 1/8 inch Allen wrench, or bending rod as shown until bubble is centered.