ALLIS-CHALMERS
Rotate the partial load mixture ad-
justing screw (A) in a clockwise di-
rection until the engine rpm begins
to fall; then lock the adjustment.
11
IF.
ADJUSTMENT WITH ANA-
LYZER AND VACUUM GAGE. Re-
move the vacuum line from the econ-
omizer and plug the line or line con-
nection at the inlet manifold. In this
method, the engine is operated with
the carburetor throttle wide open
and with sufficient load on the en-
gine to hold the rpm to maximum
operating speed (1400 rpm) or 300 to
500 rpm slower than the maximum.
With the economizer partial load ad-
justing screw (A) backed out against
the stop, rotate the entire economizer
body to give a reading of 12.8 on the
analyzer with a gasoline scale or 14.3
on the analyzer with an LPG scale.
lllG. Reconnect the vacuum line,
check the part throttle (partial load)
mixture adjustment by reducing both
the opening of the throttle valve and
the load until a manifold vacuum of
10-13 inches is obtained at the same
rpm as used in making the full load
mixture adjustment. Rotate the econo-
mizer adjusting screw (A) in a clock-
wise direction until the analyzer reads
13.8-14.5 on the gasoline scale or
14.9-15.5 on the LPG scale.
112.
MODEL Kgnl CARBURETOK.
Refer to Fig. AC49B. The LP-gas por-
tion of the Ensign model Kgnl car-
buretor (gasoline and LP-gas) and
model W regulator have 3 points of
mixture adjustment, plus an idle stop
screw. Follow the adjusting proce-
dures outlined in paragraphs lllA
through lllG when adjusting the LP-
gas section of the combination car-
buretor,
112A. The gasoline section of this
carburetor has 2 points of mixture
adjustment, plus an idle stop screw.
The idle stop screw is adjusted to pro-
vide an idle speed of 475 crankshaft
rpm or 429 belt pulley rpm. The idle
mixture screw (P) and load screw (C)
are adjusted in a manner similar to
that of any other gasoline carburetor.
Turning the idle mixture screw to-
wards its seat richens the mixture.
Turning the load screw towards its
seat leans the mixture.
112B.
The carburetor float is ad-
justed so that the top of the float in-
dexes with the first or top line which
Paragraphs 111F-114
is cast in the interior of the float
chamber. The second or bottom line
is used to adjust the float when the
system uses a fuel pump.
LP-GAS FILTER
113.
Filters used with the LP-gas
systems are subjected to pressures as
high as 150 psi and should be able
to stand this pressure without leak-
age.
Unit should be drained periodi-
cally at the blow off cock (L—Fig.
AC50A). When major engine work is
performed, it is advisable to remove
the lower part of the fllter, thor-
oughly clean the interior and renew
the felt cartridge of same if not in
good condition.
LP-GAS REGULATOR
114.
HOW IX OPERATES. In the
Ensign model W regulator, fuel from
the supply tank enters the regulating
unit (A—Fig. AC51) at a tank pres-
sure of 25-80 psi and is reduced from
tank pressure to approximately 4 psi
at the inlet valve (C) after passing
through the strainer (B). Flow through
the inlet valve is controlled by the
adjacent spring and diaphragm. When
the liquid fuel enters the vaporizing
chamber (D) via the valve (C) it ex-
M
iALANCE LINE
CONNECTION
A. Fuel inlet
B.
Strainer
C.
Inlet valY«
Fig.
AC5T^Model W Ensign LPG regulator used en fhe WD45 engine—assembled view.
D.
Vaporizing chamber
E.
Water jacket
F. OuUet valve
G. Low pressure chamber
H. Gas outlet
J. Idle connection
L.
Orifice (idling)
M. Balance line connection
T. Boss or post
27
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