TM 5-3810-294-34
j.
Replace throttle shaft needle bearings if
and use a 3A" rod with a flat end and a light hammer to
drive bearing into counterbore. When fully seated, the
side play of a new shaft is in excess of 0.005 inch.
outer end of the bearing should be .180" below the
3-24. Reassembly and Installation
machined surface adjacent to the throttle shaft
a. Insert choke shaft (26) in shaft holes and
counterbore.
rotate shaft so that flat side is down.
r.
Position retainer (8) in counterbore with lip
b. Insert choke plate (25) into air intake with
or retainer toward the throttle bore, and use 8 " rod to
spring of poppet valve down.
press retainer into counterbore so that retainer is slightly
c. Center choke plate on shaft and close
(.030" to .040") below the machined surface adjacent to
choke plate. Aline holes in plate with holes in shaft and
the throttle shaft counterbore.
install screws and lockwashers (24) loosely.
s. Repeat Step 2 to install bearing (59) in
d. Tap choke plate lightly to center plate and
counterbore on opposite side of throttle bore except that
then tighten both screws evenly and firmly.
the outer edge of this bearing should be .310" below
Note.
Be sure that poppet spring is
machined surface adjacent to throttle shaft counterbore.
outward when choke plate is closed.
t.
Install cup plug (60) in counterbore (with lip
e. Place choke bracket assembly (27, 28, 29
of plug outward). Plug should be seated so that lip is
and 30) on bracket retaining screw (36) and attach
slightly (.030" to .040") below machined surface adjacent
bracket to air intake in same position it was in before
to throttle shaft counterbore.
removal (refer to marks made before disassembly.
u. Assemble throttle shaft and lever assembly
f.
Place choke lever assembly (34 and 31) on
(9, 10, 11 and 12) in throttle body and position according
shaft (in same position it was in before removal), and
to match marks made at time of disassembly.
secure with nut (32) and lockwasher (33).
v. Insert throttle plate (3) in throttle shaft in
g. Install choke return spring (35).
same position it was in before disassembly. Center plate
h. Assemble plug (49) and washer (48) in
and then rotate shaft (counter-clockwise) to closed
choke shaft hole on opposite side of air intake.
position. Hold throttle plate closed and start screws (2)
i.
Place fiber washer (22) on main discharge
into shaft. Tap plate lightly to center in bore and then
jet (21 ) and assemble jet in fuel bowl. Tighten firmly
tighten screws.
j.
Assemble well vent jet (20) in fuel bowl and
w. Install idle adjusting needle (58) and spring
tighten lightly.
(57) in threaded passage on side of throttle body. Turn
k. Assemble fiber washer (40) on power and
idle needle in lightly against its seat, then back out
accelerating jet (41) and install jet in threaded angle
needle 1 1/4 turns
passage in bottom of fuel bowl. Place fiber washer (42)
x. Insert venturi assembly (19) in throttle body,
on plug (43), and install plug on passage over power jet.
large opening first. Rotate venturi to aline screw hold in
I.
Assemble fiber washer (47) on main jet (46)
throttle body. Install screw (13) and lockwasher (14) and
and install jet in large threaded passage in side of fuel
tighten screw.
bowl. Place fiber washer (45) on plug (44) and install
y. Assemble idle jet (56) in counterbored hole
plug in passage over main jet.
in machined surface near venturi.
m. Install plugs (38 and 39) in bottom of fuel
z. Assemble washer (55) on fuel valve seat
bowl.
(54) and install seat in throttle body. Place fuel needle
n. Install power jet valve (51) in bottom of fuel
valve (53) in seat.
pump cylinder.
aa. Position float assembly (17) in hinge
o. To install check valve assembly (50), start
bracket and insert float axle (52) through hinge bracket
check valve into counterbore in bottom of fuel bowl with
and float lever bushing from side opposite slotted end of
small opening out and aline valve so that it is not cocked.
bracket.
Use a /4 " punch and a light hammer to drive the valve
ab. With throttle body inverted, check the float
squarely into the channel. Top of valve should be just
setting. The dimension from the top of the floats to the
below top end of channel when in place.
machined surface (without gasket) should be 1-19 / 32".
Note. Steps should be performed only if
To increase or decrease this distance, use long nose
the old bearings were removed and new bearings are
pliers to bend float lever close to float body.
being installed.
Note. Do not bend, twist or apply pressure
p. Assemble felt seal (6) in bottom of throttle
on float bodies. The float bodies when viewed from the
shaft counterbore on side of throttle body where throttle
free end of the bodies must be centered and at right
lever will be installed.
angles to the machined surface and must move freely on
q. Position bearing (7) squarely in counterbore
the float axle.
3-11
