Paragraphs 111A-111E
lllA. IDLE STOP SCREW. Idle
speed stop screw on the carburetor
throttle should be adjusted to provide
a slow idle speed of 475 crankshaft
rpm or 429 belt pulley rpm.
11
IB.
STARTING SCREW. Imme-
diately after the engine is started,
place the throttle in the wide open
position and the choke in the fully
closed position. Rotate starting screw
(H—Fig. AC49A) until the highest en-
gine speed is obtained. A slightly rich-
er adjustment (counter-clockwise un-
til speed drops slightly) may be de-
6AS0LINE
INLET
sirable for a particular fuel or operat-
ing condition. Average adjustment is
one turn open.
me.
IDLE MIXTURE SCREW.
With the choke open, engine warm
and idle stop screw set, adjust idle
mixture screw (K—Fig. AC51) which
is located on regulator until best idle
is obtained. An average adjustment is
% of a turn open.
HID.
LOAD SCREW OR ECONO-
MIZER. Refer to Fig. AC50. The ef-
fect of the load screw or economizer
(located on carburetor) is to provide
Fig.
AC49B—Model Kgnl Ensign carburetor, which is designed to operate on LP-Gas or
gasoline, is used on some model WD45 tractors. Fuel adfusting load screw (K) Is replaced
with an Ensign model 3069 dry gas economizer. Thumb screw (W) is used to close ott the
gasoline inlet valve.
ALLIS-CHALMERS
adjustable control of the partial or
light load mixture by means of ad-
justing screw (A). The richer mix-
ture required for maximum power is
adjusted by varying the depth to
which the entire economizer body is
screwed into the fuel passage of the
carburetor. The economizer body thus
becomes the load screw.
In partial or light load operation,
the economizer plunger (6) is moved
into the main fuel passage by the high
manifold vacuum applied behind dia-
phragm (3). Restricting or partially
closing off the main fuel passage pro-
vides a leaner part throttle mixture.
When manifold vacuum falls below
4-6 inches Hg., the economizer spring
retracts the plunger and provides a
richer power mixture.
lllE.
ADJUSTMENT WITHOUT
LOAD. Carefully adjust the idle mix-
ture as outlined in paragraph lllC.
Remove the vacuum line from the
economizer and plug the line or line
connection at the inlet manifold. Dis-
connect rod from carburetor tnrottle
lever and rotate idle stop screw to
produce a high idle rpm of 1720. With
economizer partial load adjusting
screw (A) backed out against the
stop,
loosen economizer body locknut
and rotate the entire unit until maxi-
mum rpm is obtained. Note this posi-
tion; then rotate economizer body in
an opposite (counter-clockwise) di-
rection until rpm begins to fall. Ro-
tate the entire unit to the mid-point
of these positions and tighten the
locknut. Unplug the manifold connec-
tion and reconnect the vacuum line.
A. Venturl
B.
Nozzle
C. Gasoline main load
adjusting screw
F.
Choke disc
H. LP-Gas starting screw
J. Choke lever
K. Economizer location
L. Gas inlet
M. Cam lever
N.
Main orifice
O. Cover plate
P.
Gasoline idle mixture
adjusting screw
Q. Venturi nozzle
R. LP-Gas idle fuel inlet
S. Gasoline float
T. Balance line pitot tube
U. Gasoline inlet valve
V. LP-Gas pitot tube
W. Thumb screw
Y. Orifice, load screw
Z.
Gasoline fuel inlet
A. Adjusting screw
(partial load)
B.
Adjusting screw stop
C. Vacuum connection
1.
Cover attaching
screws
2.
Cove-
3.
Diaphragm
4.
Budy assembly
5.
Locknut
6. Plunger
L
Fig AC50A—LP-Gas filter used on model
WD45 engine.
Fig.
AC50—Ensign model 3069 dry gas economizer as used with
the Ensign Kgl or Kgnl carburetor on th«» model WD45 engine.
L. Drain plug
1.
Fuel inlet
2.
Filter cartridge
3.
Outlet passage
6. Stud nut
6. Filter bowl
26
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