6-01
Governors
6-01
Part 6 Governors
COMPONENT INDEX
Page
COMPONENT INDEX
Page
DESCRIPTION AND OPERATION .................. 6-01
RPM Adjustments ................................................. 6-03
TROUBLESHOOTING ..................................... 6-01
No-Load Surge Adjustment .................................. 6-03
ADJUSTMENTS
REMOVAL AND INSTALLATION ......................... 6-04
Preliminary Checks .................................... 6-03
DESCRIPTION AND OPERATION
open wide enough, the plunger shuts off the bottom port
and the top port supplies vacuum to the carburetor
distributor vacuum passage for sufficient vacuum to the
distributor.
VELOCITY GOVERNOR
The velocity governor (Figure 1) is a single unit
mounted between the carburetor and the intake
manifold. There is no provision for repair of this
governor. It should be replaced when damaged.
The governor is operated by a combination of
manifold vacuum and the air flow past the governor
valves. The governor throttle valves are offset in the
throttle bore so that the combined force of manifold
vacuum and the fuel air flow through the bores has
greater effect on the larger, upstream area of the valves.
This forces the throttle valves to move toward the closed
position restricting fuel-air flow. The closing action of the
throttle valves is opposed by the control spring. The
control spring is attached to the throttle valve shaft cam.
The cam provides a balance between the closing action
of the throttle valves and the action of the control spring
at all engine speeds.
FIG. 1 Typical Velocity Governor
Under operating conditions, the governor throttle
valves do not close, but remain open enough to allow the
required quantity of the fuel-air mixture to flow into the
manifold to maintain the governed engine speed.
To maintain the proper vacuum to the distributor, the
governor has two interconnected vacuum transfer ports
and a vacuum transfer plunger. When the governor
throttle valves are forced toward the closed position,
vacuum from the lower port is supplied to the distributor
to maintain sufficient spark advance. When the governor
throttle valves are
