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to figure 4-1:
16.
Plug and gasket assembly
1.
Retainer
17.
Screw
2.
Washer
18.
Gasket
3.
Gasket
19.
Fuel bowl
4.
Throttle plate
20.
Bowl vent bushing
5.
Throttle body
21.
Idle channel filler tube
6.
Plug and bushing (idle air bleed)
22.
Intake drain disk
7.
Spring
23.
Plug and washer
8.
Idle mixture adjusting screw
24.
Choke plate
9.
Float and pin assembly
25.
Washer
10.
Gasket
26.
Discharge jet
11.
Venturi
27.
Needle, seat and gasket assembly
12.
Well vent jet
28.
Idle jet
13.
Choke shaft assembly
29.
Plug
14.
Screw
30.
Throttle shaft
15.
Main jet
31.
Screw
c. Cleaning.
the throttle body, with the assembly inverted so the float
holds the valve closed. Before installing the carburetor
(1) Clean all metal parts in approved solvent (or a
on the truck, check the operation of the choke and
commercial carburetor cleaner) and dry thoroughly with
throttle plates and shafts. The plates should close the
compressed air or a clean, lint free cloth.
bores without binding or sticking. Adjust the carburetor
(2) Clean all small passages and orifices with a
as described in TM 10-3930-627-12.
soft wire or some other suitable probe, being careful not
to enlarge any passages while cleaning.
4-3. Governor Repair
d. Inspection.
a. Removal.
(1) Inspect float for cracks, dents, holes, and
(1) Remove the governor spring from the
worn spots. Submerge float in warm water (about 140
governor control lever (24, fig. 4-2).
(2) Remove the linkage between the governor
F) and look for bubbles indicating air leaks. Discard
and carburetor (TM 10-3930-627-12).
leaky float.
(3) Remove the upper capscrew, washer, and
(2) Inspect shafts for mutilated screw hole
gasket plate securing the governor to the gear cover at
threads and loose fit in casting.
the upper mounting hole (fig. 4-3).
(3) Inspect valve and valve seat for wear.
(4) Remove the lower capscrew and washer
Replace with new parts if worn.
Inspect mating
attaching the governor to the gear cover, and the nut
gasketed surfaces for warpage. Replace parts showing
and washer shown at the side of the governor. Remove
noticeable warpage.
the governor and its mounting gasket from the engine.
e. Assembly. Reverse procedures in a. above to
assemble the carburetor. Before installing the throttle
body to the fuel bowl, check the float level. The proper
float setting is 1/4 inch from the float to the surface of
4-3
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