Governor

TM 5-4320-258-34

and for wear of the pump link hole. Replace if

(1) To remove the float axle (3), press a

damaged.

screwdriver against the float axle at the slotted side of

(10) Inspect the air shutter plate for

the float hinge bracket. Remove the axle from the

distortion, burrs, and damaged edges. Make sure the

opposite side and remove the float (4).

poppet valve on the choke plate is free. Replace a

(2) After the float is removed, take care

damaged choke plate.

that the fuel valve (5) does not drop from the valve seat

(11) Inspect the air shutter shaft for cracks,

(6).

distortion, and for worn bearing surfaces. Replace if

(3) Use a file to match-mark the throttle

damaged.

lever (on the throttle shaft (30)) and the throttle body

(12) Inspect the fuel bowl assembly and

(36). These marks will serve as a guide to assure that

throttle body for cracks, distortion, damaged threads,

the parts will be reassembled in the proper manner.

and other damage. Inspect the bearing surfaces of the

(4) Use a file to match-mark the air shutter

throttle shaft and air shutter shaft bores for wear or

bracket (46), air shutter lever (41), and the boss on the

scoring. Replace damaged housings.

fuel bowl (67). These marks will serve as a guide to

(13) Inspect all other parts for cracks,

assure proper reassembly.

distortion, and other damage; replace damaged parts.

(5) To remove the plug (31), insert a 1/4-

d. Reassembly.

Refer to figure 3-3 to

inch rod, 6 inches long, through the opposite side of the

throttle body (36) and drive out the shaft hole plug (31).

reassemble the carburetor. Reassembly is the reverse

c. Cleaning and Inspection.

of disassembly. Note the following:

(1) During reassembly, aline the match

(1) Clean all parts in an approved

marks made during disassembly on the fuel bowl (67),

carburetor cleaner. Wash with cleaning solvent (FED.

air shutter bracket (46), air shutter shaft (49), and lever

Spec. P-D-680). Dry thoroughly with compressed air.

(41).

Caution: Do not clean by inserting a wire or drill into any

(2) Aline the match marks made at

openings or passages as this will destroy their fine

disassembly on the throttle body (36) and lever of the

calibration.

throttle shaft (30).

(2) Blow out all passages in the air intake,

(3) Note that the screw holes in the throttle

fuel bowl, and throttle body with compressed air. (3)

plate (29) are off-centered. Start the side of the throttle

Inspect the float for cracks, worn float axle bearing,

plate with the shortest distance between the screw holes

wear in the needle valve contact area, and other visible

and beveled edge into place first. The plates are made

damage. Replace the float if it is damaged or if it is

with two opposite edges beveled to fit the throttle body

loaded with gasoline.

bore when the plate is closed. The throttle plate will not

(4) Inspect the float axle for wear on the

close tightly if installed upside down. Pressure on the

bearing surface. Replace if any wear can be

plate must be maintained with the finger until the screws

detected.

are tightened. When properly installed, the side of the

(5) Inspect the needle valve and needle

throttle plate farthest away from the mounting flange will

valve seat for wear or damage. Both parts must be

be alined with the idle discharge holes when the plate is

replaced as an assembly if either is damaged.

closed.

(6) Inspect the idle adjusting screw for

e. Installation.

Install and adjust the

damaged threads and for a worn needle point. The

point must be sharp and free from ridges of the tapered

carburetor (TM 5-4320-258-12).

3-4.

Governor

area.

a. Removal. Remove the governor from the

(7) Inspect the throttle plate for burrs or

damaged edges. Clean with crocus cloth to remove

engine (TM 5-4320-258-12).

b. Disassembly. Disassemble the governor,

light burrs. Do not use a buffing wheel on the throttle

plate. Replace if edges are damaged.

following the sequence of numbers assigned to figure 3-

(8) Inspect the throttle shaft for wear of the

4. Note the following

bearing areas. Replace the shaft if visible wear is

noted.

(9) Inspect the pump lever for distortion

3-6