TM 5-3810-294-34
a. Remove filter head (64), washer (631 and
t.
Remove main jet (46) and washer (47) from
filter (62) from throttle body.
threaded passage in side of fuel bowl.
b. Remove six throttle body to bowl screws (4)
u. Remove well vent jet (20) from center of
and lockwashers (5).
large opening in fuel bowl.
c. Pry throttle body assembly up slightly from
v. Remove power jet valve (51) from bottom
fuel bowl and loosen gasket (18) from fuel bowl. Lift off
of pump cylinder.
w. Remove main discharge jet (21) and
throttle body being careful to avoid damaging the float
assembly.
washer (221 from center of large opening in machined
d. Invert throttle body and remove bowl to
surface of bowl.
x. To remove check valve (50), thread a
body gasket (18) from machined surface of throttle body.
Then remove pump assembly (16) by pushing in on
screw extractor tool into check valve until tool is firmly
piston and then pulling out sharply to unseat piston
fastened in valve body. Then pull outward on extractor
retainer in throttle body recess.
tool to unseat check valve, and remove valve and tool
e. Remove float axle (52) and float assembly
from fuel bowl.
y. Mark across choke lever, choke bracket
(17).
f.
Remove fuel needle valve (53) from seat.
and air intake body as a guide to correct reassembly.
Then remove valve seat (54) and fiber washer (55) from
Then remove choke spring (35).
z. Remove choke lever nut (32), lockwasher
throttle body.
g. Remove idle jet (56) from passage near
(33) and lever assembly (34 and 31).
aa. Remove plug (49) and washer (48) from
fuel valve seat.
h. Remove idle adjusting needle (58) and
choke shaft hole on opposite side of air intake body.
ab. Remove screws (23) and lockwashers (24)
spring (57) from side of throttle body.
i.
Remove venturi screw (13) and lockwasher
and choke plate (25) from air intake opening. Then
(14) from side of throttle body and then remove venturi.
remove choke shaft (26) from choke shaft hole.
j.
ac. Remove choke bracket retaining screw
File off riveted end of throttle plate screws
flush with throttle shaft, being careful not to damage
(36) and choke bracket assembly (27, 28, 29 and 30)
throttle plate or throttle bore.
from side of air intake.
k. Back out throttle stop screw (11) until end
3-22. Cleaning
of screw is flush with stop lever. Then close throttle
Clean all metal parts in dry cleaning solvent (Federal
lever, and mark across throttle body and lever as a guide
Specification P-S-661) and dry thoroughly with
to correct reassembly of parts.
compressed air. Blow out all passages in the air intake,
l.
Remove throttle plate screws (2), throttle
throttle body, and fuel bowl. Clean all carbon deposits
plate (3) and then remove throttle shaft and lever
from throttle bore and idle port.
assembly (9, 10, 11 and 12) from throttle body.
3-23. Inspection and Repair
Caution: Do not remove throttle shaft
a. Replace float if loaded with fuel, float is
bearings unless new bearings are available for
damaged, or if float axle bearing is worn. Inspect float
for wear on top side where float contacts fuel valve
replacement.
needle.
m. Insett a long rod through retainer on throttle
b. Replace float axle if axle is worn, bent, or
lever side of throttle body, and drive cup plug (60) out of
damaged.
throttle body.
c. Replace fuel valve seat and needle because
n. Thread a screw extractor tool into needle
both parts are subject to wear and could cause improper
bearing assembly, and then use a rod to drive against
float level.
end of tool until bearing (59) is free of throttle body.
d. Replace idle adjusting needle and spring if
o. Thread a screw extractor tool into retainer
wear is evident or if needle is not smooth and free of
(8). Then insert rod from opposite side of throttle body
ridges.
and drive out retainer. Repeat step n to remove bearing
e. Replace throttle and choke plates if worn,
(7) from throttle body.
bent or damaged.
p. Remove felt seal (6) from throttle body
f.
Replace pump assembly if wear and
opening.
bending are evident.
q. Remove plug (44), washer (45), plug (43)
g. Replace power jet valve (51).
and washer (33) from fuel bowl.
h. Replace throttle and choke shafts if wear is
r.
Remove plugs (38 and 39) from bottom of
evident on bearing surfaces.
fuel bowl.
i.
Replace entire carburetor if fuel bowl or
s. Remove power and accelerating jet (41)
throttle body are worn or damaged or if parts do not fit
and washer (40) from threaded angle passage in outside
properly in passages.
bottom of fuel bowl.
3-10
