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10-60
MAIN BODY
I.
Turn the main body upside down
and catch the accelerating pump discharge
needle
(Fig. 27).
2.
With a 3/8 deep
.
socket, remove
the power valve from
the
floor of the main
body fuel bowl
(Fig.
27).
3.
Remove the main metering
jets
(Fig. 27) from
the fuel bowl with a jet
tool.
4.
Using long nose pliers, remove
the
accelerating
pump
inlet
check
ball
retainer,
then
turn the main body over
and
catch
the ball
from
the pump well.
CHOKE HOUSING
SECQoiDARY
PRIMARY THROTTLE'
THROTTLE PLATES
SHAFT AND LEVER
ASSEMBLY
FIG. 28- Throttle Body- Bottom View
THROTTLE
BODY
Do
not remove the idle mixture
limiter
caps
or the mixture screws from
the throttle body.
1.
Remove
the throttle body to
main body
screws
from the bottom of the
throttle body
(Fig.
28)
and separate the
two castings.
2.
Remove the
choke
housing cover
screws, cover, gaskets and
thermostatic
spring.
3.
Remove the
choke
piston lever
retaining
screw,
then remove the piston
assembly.
4.
Remove the retainers from the
secondary
throttle
lever
to
primary
throttle
connecting
link, then remove the
link.
5.
If
it is
necessary to remove the
throttle plates or
shafts
from the throttle
body, remove the
staking
marks on the
throttle plate
attaching
screws. Remove
tlie
screws and remove the
plates.
GROUP 10-
FUEL SYSTEM
6.
Remove
the
nut
from
the
secondary
throttle
shaft,
then remove the
lockout lever and and slide the shaft and
return spring out of the throttle body.
7.
Remove the
nut
from the primary
throttle shaft and remove the fast idle
lever and adjusting screw (the 351 C
engine has a two-piece fast idle lever).
Slide the throttle shaft and primary
throttle shaft and lever assembly out of
the
throttle plate.
8.
Remove the primary throttle lever
assembly
retainer, then slide the lever and
springs off the
shaft.
9.
If
it
is
nec.
e ssary to remove the
fast
idle
cam or bushing. carefully press
the bushing out of
the
choke housing and
bushing column. The column may bend
out of alignment or break without proper
support to the column during bushing
removal or installation.
ASSEMBLY
Make
sure all
holes in the new gaskets
have been properly punched
and
that no
foreign
material
has adhered to the
gaskets. Gasket surfaces must be clean and
flat
and
free of nicks or burrs.
The carburettor assembly
is
shown in
Fig. 29
.
THROTTLE BODY
1.
If the
throttle
plates and shafts
are
removed,
slide·
the primary throttle
return spring (coiled clockwise) on the
primary throttle shaft (flat milled) and
slide
the shaft into the primary shaft holes
(mixture needle side of body).
2.
Position
the
primary
throttle
plates (smaller diameter) in the primary
bores with the ground flat edge of the
plates facing up and towards the idle
tnix ture
needles.
Install the plate retaining
screws
snug but not tight.
3.
Rotate the throttle shaft to the
closed position and tap the plate lightly
with the end of a
screw
driver handle or
similar tool,
so
that the plates are pro-
perly and fully seated in the throttle
bores (when viewed with a light behind
the plates, little or no light should be
observed).
Tighten
the throttle plate
screws.
4.
Install the
secondary
throttle lock
out lever.
5.
Install the fast
idle
speed lever
and adjusting screw.
6.
If the fast idle cam and bushing
were removed,
insert
the automatic choke
shaft bushing tlwough the choke housing.
Position the fast idle cam between the
choke
housing and bushing column. Slide
the bushing
through
the fast idle cam.
Press the bushing in the
choke
housing
and
into
the
column. Clean the
bushing with a
1/4-inch
reamer.
7.
Insert
the automatic choke shaft
and lever in the bushing.
8.
Position
the
automatic choke
piston in the
choke cylinder and the
lever
on
the
automatic choke shaft.
Install the
retaining
screw.
9.
Insert
the secondary
throttle
to
primary throttle
connecting
rod
into the
throttle levers
and install retainers.
MAIN BODY TO
THROTTLE BODY
l.
Position
the main
body on
a
working
surface with the fuel
bowl
down.
2.
Position
the
main
body
to
throttle body
gasket
on the main
body.
3.
Position the
throttle
body on
the
main body
and install the retaining
screws.
4.
Invert
the
main body
and
the
throttle body
so the fuel bowl is
upward.
5.
Install the power valve
and main
jets
in the main body.
6.
Install
the
choke to throttle
lockout
lever.
7.
Place the
accelerator
pump
ball
check in the
pump
inlet hole of the pump
chamber.
Install the ball check retaining
ring.
8.
Place
the
accelerator
pump
discharge needle
into the
pump
discharge
cavity.
AIR HORN
1.
Install the
components removed
from the
air
horn in
the following
order:
a.
Power valve
and gasket.
b.
Auxiliary
fuel inlet valve and
gasket.
2.
Assemble
the accelerator
pump
plunger
(Fig. 30) and insert into air
horn.
3. ·compress the pump
plunger
and
insert
accelerator
pump
arm into plunger
stem.
Insert the
split
pivot pin through
the
specified hole
in
the lever
and
the
air
horn
casting.
4.
If the
choke
plate
and shaft
were
removed,
slide
the
choke shaft
through the
holes in the
air
horn. Install the choke
shaft lever on the end of
the shaft on
the
automatic
choke
side.
The lever and shaft
are tapered and the attaching
screw
has a
left hand thread.
Insert the
choke
plate
into the slot in
the
choke shaft and install the plate
retaining
screws snug
but not
tight.
5.
Close
the
choke
plate
and
gently
tap the plate with
the end of a screw
driver or
a similar
tool to properly
position the plate
in the air
horn.
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