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10-48
PART
10-5
MOTOR CRAFT MODEL 4300 4-V CARBURETTOR
Section
1.
DESCRIPTION AND OPERATION
Description ...
...
...
...
.
..
Operations
...
..
.
...
...
.
..
Fuel
Inlet
System
Idle
Fuel Supply System
Primary Main
Fuel
Metering System
Accelerating
Pump
System
...
..
. .
..
Power
Fuel Supply System...
..
. .
..
Seco
ndary Main
Fuel
Metering System
Automatic Choke System ........... .
2.
IN-CA
R
ADJUSTMENTS
AND REPAIRS
Idle
Speed
Adju stment
........
.
Idle
Limiter Cap Replacement
... ...
. ..
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Section
3.
MAJOR REPAIR OPERATIONS
Removal
...
Disassembly ... .
..
Air Horn ...
..
.
Main Body
Throttle Body
..
Assembly
...
.....
.
Throttle Body
Air Horn
..... .
Air Horn to Main Body ...
0
DESCRIPTION AND OPERATION
DESCRIPTION
The
Motorcraft
Model
4300
4-V
Carburettor (Figs,
1,
2 and 3)
is a
three-pie
ce
,
separately
cast
design
consisting of
the air horn, main body and
throttle body.
A
cas
t-in
centre fuel
inlet
has
provision for a supplementary fuel inlet
system.
The fuel bowl is vented by an
internal balance vent.
The hot idle compensator shown in
some
illustrations is not fitted when
this
carburetor
is fitted
to the Cleveland
engine.
The main
(primary)
fuel system has
booster-type
venturis
cast
integral with the
air horn
and
the main venturis are cast
integral
with
the
main
body.
The
secondary
throttle plates are mechanically
operated
from
the primary linkage. Air
valve
plates
are
located
above
the
secondary main ven turis and an integral
hydraulic
dashpot
dampens
sudden
movement
of
the
air
valve plates to help
prevent
flutter
and
erractic
engine
operation. A single fuel bowl supplies both
the primary and secondary fuel
systems.
Pontoon-type floats are used to help
cornering and
hill climbing
capability.
The
accelerating pump is
of
the piston -type,
located in the fuel bowl.
-
HOT
IDLE
COMPENSATOR
•THUNDERRIRD. CONTI
N
ENTAL
MARK
Ill,
AND LINCOLN CONTINENTAL ONLYI
PRIMARY
THROTTLE
SH.:.
FT
FAST
IDLE
SPEED
ADJUSTI
NG
SC
REW
FIG. 1- Matorcraft
Mode/4300 4-V Carburetor
-Right Rear 3/4 View
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VI268.
A
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