Adjustment. - TM-10-3930-627-120056

TM 10-3930-627-12

b. Installation. Reverse procedures in a above,

(4) Accelerate engine and check for no-

load governed speed of 2, 600 rpm. Also check to see

using a new gasket. Connect choke control with button

that there is no surge in full operating range of governor.

fully in and valve fully open.

c. Adjustment.

(5) If adjustment is needed, proceed as

follows:

(1) Remove the pipe plug from the intake

(6) Loosen externally relieved bolt lock nut

manifold.

(8) and back off on bolt so that it will have no effect on

(2) Install an adapter in the pipe plug

governor.

opening and connect a vacuum gage to the adapter.

(7} To decrease engine speed, loosen

(3) Start the engine and allow it to warm up

speed control nuts ( 11); this decreases tension on

until normal operating temperature has been reached.

spring. To increase speed, tighten speed control nuts.

(4) Using a tachometer, adjust the engine

(8) The externally relieved bolt (8) adjusts

to normal idling speed by means of throttle stop screw.

no-load surge. If governor surges, screw bolt in until

Idling speed is 500 rpm.

surge is eliminated. Do not screw in far enough to

(5)

Turn the carburetor idle adjusting

increase rpm at idle speed. Lock bolt in position with

needle (2) to obtain the highest possible vacuum reading

locknut.

on the gage. The reading should be constant with very

(9) Remove tachometer.

little movement of the hand on the vacuum gage.

4-24. Air Cleaner

4-23. Governor

a. Removal of Governor Linkage.

The truck uses a dry type paper element carburetor air

cleaner. Service is limited to removing and cleaning or

(1) Disconnect carburetor-to-governor rod

replacing the filter element. Proceed as follows:

(6, fig. 4-6) from governing lever (7).

a. Remove wingnut and top of air cleaner and

(2) Loosen governor throttle clamp lever

lift out element.

screw (4) at throttle shaft, then remove throttle clamp

b. Tap element on a hard surface to dislodge

from shaft.

dust. If necessary, brush gently with a soft brush. Do not

(3) Disconnect carburetor to governor rod

wash or oil this element.

from throttle lever.

c. If element shows signs of oil film or does not

(4) Remove clamp lever screw (4) and nut

clean easily, replace it; otherwise reinstall element in air

from clamp.

cleaner.

(5) Separate lever, clamp, spring, and

screw.

4-25. Fuel Tank

(6) Disconnect governor spring (9) from

a. Removal.

governing lever and spring adjusting screw (10) and

(1) Remove drain plug (13, fig. 4-7) to drain

remove spring.

gasoline. Disconnect gage wire from transmitter.

b. Installation of Governor Linkage. Reverse

(2) Remove gas cap (1).

procedure in a above and adjust governor.

(3) Remove fuel line (2) from elbow (3) and

c. Adjustment of Governor.

shutoff cock (6). Remove elbow and shutoff cock.

(1) Place transmission shift lever in the

(4) Remove fuel filter (5), elbow (4), and

neutral position and apply parking brake.

nipple (7).

(2) Install a tachometer on the engine.

(5) Remove screw (12), nut (8), lock

(3) Start and run engine until normal

washer (9), and flat washer (11) attaching fuel tank (10).

operating temperature is reached.

4-11