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(121)
ENGINE FUEL AND EXHAUST SYSTEMS
STROMBERG CARBURETOR
3-47
HOUSING
quired to obtain specified clearance.
12; Install air cleaner and silencer.
3-31 DISASSEMBLY, CLEANING,
ASSEMBLY OF STROMBERG
AUTOMATIC CHQKE
a. Removal and Disassembly
1. Remove carburetor assembly from engine.
2. Remove three screws and lug-washers;
then remove thermostat cover with thermostat.
See figure 3-74.
3. Remove lock nut from choke stem, using
Wrench T-25047; then remove lock washer and
serrated washer.
4. Remove choke housing screws and while
removing housing slide the vacuum piston lever
off choke stem. Remove piston from housing.
5.
Disconnect fast idle rod from choke stem
lever. Remove choke valve and the choke stem
and lever assembly.
6. Remove lead ball plugs from choke hous-
ing, using Plug Remover T-25052, shown in
figure 3-85. Be careful not to damage plug seats
in housing.
VACUUM PISTON
ASSEMBLY
~
COVER SCREWS
§~~~- - - - - - - -
~SlOT((3 "~ :
WASHERS
SERRATE:!?
~
@
\
~
COVER WITH
WASHER
.J!
-
.
·
THERNIOSTAT
LOCKWASHER LOCKNUT
~~
Figure 3-74-Stromberg Choke-Disassembled
b. Cleaning and Inspection
1. Allow all parts to soak in suitable cleaner
bath to remove all foreign material. Bendix
Carburetor Cleaning Solvent is recommended
for this purpose. Regardless of cleaning mate-
rial used, however, be sure to thoroughly rinse
the parts in kerosene, distillate, or white gaso-
line to remove all gummy deposits that have
been
softened by
the cleaner.
2.
It
is
particularly
necessary for the piston
and the cylinder
in
housing to be
thoroughly
clean and free of bu
r r s or
scores. Do
not
use
any abrasive material for
cleaning
piston and
cylinder.
If
piston or cylinder is scored, replace
the affected part.
3.
If
thermostat is distorted or damaged it
must be replaced with a new thermostat cover
with thermostat assembly. The thermostat is
not furnished separately because the "V" index
mark is stamped on cover after installation of
thermostat, to insure proper calibration.
4. Remove gum or other foreign material
from the choke stem bearings in air horn, us-
ing cleaning fluid; do not scrape bearings with
a cutting tool.
Check
chok
e
stem for free ac-
tion in air horn.
If
stem is worn so that exces-
sive play in bearings
exists,
replace the stem
and lever assembly.
If
choke val
ve
is bent or
otherwise damaged it should be
replaced.
c. Assembly and Installation
1. Install lead ball plugs in choke
housing,
using Plug Set
T-25053
(tool in figure 3-88).
2. Install choke stem and valve in air horn.
Close valve and check for uniform clearance
between edges of val
ve
and wall of air horn.
If
clearance is not uniform, or valve sticks in air
horn at any
point,
loosen screws and shift valve
to obtain uniform clearance and freedom from
sticking.
It
is important to have the choke valve
fit
properly,
otherwise hard starting
may
result.
3. Place vacuum piston in
cylinder
with
slot on
piston down ; this
is
v
ery important.
Do not use
lubricant
of any
kind on pisto n
or
in cylinder.
4. With the housing gasket in
place,
install
choke housing on
the
air horn
;
at the same time
place piston
lever
on choke stem. Install hous-
ing screws, making cer tain choke stem does not
bind.
5. Install serrated washer with the serra-
tions matching those on the
lever.
Install lock
·
washer and lock nut
;
at this time turn the nut
only finger-tight.
Figure 3-75-5e"ing
Vacuum
Piston
with Gaug
e
T-25046
6. P
lace pist on
setting Gauge T-2
5046
on
chok e
housing
with a sm
all hole
fitting over the
pin of the chok
e lever.
There
a
r e two indicator
lines on the face of the
gauge.
The gauge should
be positioned so that the indicator rib on top
of the choke housing is centered between the
indicator lines. See figure 3-75.
7. Place drill, of size specified below, between
choke valve and wall of air horn and hold choke
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