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CARBURETOR-BBD
1 ' / z
INCH
14-3 1
speed. Repeat steps 2 and
4
above if necessary. After
the proper idle speed has been obtained, refer to (Fig.
3) of the Throttle Linkage Group in this Section,
for the procedure on adjusting the transmission con-
trol rod.
Fast Idle Speed
Ion
the Vehicle after
Approximately
500
miles
if
necessaryj
To set the fast idle speed on the car, connect a
tachometer, then set the curb idle speed and proceed
as follows:
(1) With the engine running and the transmission
in the neutral position, open the throttle slightly.
(2) Close the choke valve about 20 degrees then
allow the throttle to close. Return the choke valve to
the open position.
(3) The fast idle speed adjusting screw should be
contacting the slowest speed step on the fast idle cam,
as shown in (Fig. 18).
(4)
With the engine warmed-up to the normal oper-
ating temperature, turn the fast idle speed adjusting
screw
in
or
out
to secure
700
r.p.m.
Reposition the
cam and throttle after every screw adiustment to
a p
ply normal throttle closing torque.
BBD (1
'/2
INCH) CARBURETORS
stamped on metal tag attached to air horn. Do not
re-
move or destroy this tag, as it is the only means pro-
vided for carburetor model identification. Before at-
tempting to repair or overhaul carburetor, refer to
model number and secure a repair kit for number
indicated on tag.
The Ball and Ball carburetor is of the dual down-
draft type. Each throat has
its
own throttle valve, idle
and main metering systems and are supplemented by
the float, accelerating and power systems.
On each BBD series carburetor, the model number i s
SERVICE PROCEDURES
hauling, refer to (Fig. l), then proceed as follows:
DISASSEMBLY
(1) Insert three Tool T109-287s and one
Tool
To disassemble the carburetor for cleaning or over-
ACCELERATOR
PUMP ROCKER ARM
R A W 1
V F N T
1
FAST IDLE
CHOKE OPERATING
LINK
STAGING
f W O K F V A l V E
\
SPRING
-.
,
-
. .
-
.
.
.
-
.
-
\
\
CARBURETOR
STAGE
''
\
HUB LEVER
DISTRIBUTOR
VACUUM
l n n u l
I L L
'
CHOKE
'
'OD'
I
DIAPHRAGM
ELEVATOR LEGS
_. ..
VACUUM
I
V D L
ri
I I
I I Y V
(SET
O F
4)
VACUUM
\
lULt
M I A I U K t
SCREW
(2)
THROTTLE LEVER
DIAPHRAGM
HOSE
NK611
Fig. I-Carburetor
Assembly
IBBD-3849s and BBD-3850S)
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