TOPIC 8. GOVERNOR

TM 10-3930-644-14&P

TOPIC 8. GOVERNOR

A. GOVERNOR DESCRIPTION

C. INSPECTION

The governor prevents engine speed from exceeding a

1. Wash governor in a clean solvent and dry with

predetermined maximum. The governor is mounted

compressed air.

between the carburetor and manifold flanges. It consists

of a main body, which contains a throttle shaft, a throttle

2. Check governor for wear, cracks or damaged

valve and a main governor spring. The main governor

surfaces.

spring is attached by linkage to the governor shaft and

the spring force holds the throttle valve open.

D. INSTALLATION

When the engine starts, air flows through the carburetor

1. Install new gaskets and spacer on carburetor.

throat and the governor throat. The velocity of the air

creates a pressure above the throttle valve. When this

2. Position governor on carburetor and connect

force exceeds the force exerted by the spring, the

manifold fitting. Secure with studs, lockwashers

throttle will move to a closed position. The adjusting

and nuts.

screw varies the spring tension (Figure 10).

3. Install lock wire and seals.

When the closing action of the valve exactly balance the

spring, governing action takes place and maximum

E. GOVERNOR ADJUSTMENT

speed is foxed at this point.

NOTE

When load is applied the velocity of the gas through the

The desired engine speed is obtained

manifold and the pressure against the governing valve is

by increasing or decreasing the

reduced and the spring opens the valve to feed more

governor spring tension.

gasoline to the engine to handle the increased load

demand. This maintains an almost constant speed

Turn adjusting screw (Figure 10) in or out, to increase or

whether the engine is running with or without load.

decrease pull on the spring.

B. GOVERNOR REMOVAL

1. Remove the nut, lockwasher and stud securing

the governor to the carburetor.

2. Disconnect the governor from the manifold fitting

and remove lock wire and seals.

3. Remove governor, seals and spacer from the

carburetor.

Figure 10. Velocity Governor

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