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3-4
DESCRIPTION
ENGINE FUEL AND EXHAUST SYSTEMS
(78)
baffle "E" on bottom of cleaner element extends
down into the oil and prevents oil in the sump
from pulling over into the air stream. See
figure 3-3.
The sudden change in direction of air at "B"
causes the heavier dust particles in the air to
be thrown into the oil in sump. Oil mist is
carried upward by the air stream into the
cleaner element in a predetermined amount
which automatically oils and washes the filter-
ing mesh. The lighter dust particles which were
not thrown into the oil sump at "B" adhere to
the oily surfaces of the oil-wetted filtering mesh
and are washed back into the oil sump as the
oil drains back from the cleaner element. All
dirt particles settle to the bottom of the oil
sump at "D" (fig. 3-3).
Cleaned air leaving the cleaner element passes
through the silencer which muffles the noise.
PEDAL ROD
Figure 3-4-Carburetor ThroHle Control linkage
e.
Carburetor Thro"le Control Linkage
The carburetor throttle control linkage is
designed to provide positive control of the
throttle valves through their entire range with-
out being affected by movement of the engine
in its rubber mountings. The linkage also serves
to operate the accelerator vacuum switch when
cranking the
engine.
The accelerator pedal is connected by a rod
and ball joint to an accelerator lever on the
lower end of a vertically mounted equalizer
shaft. The equalizer shaft is supported at
the
lower end by a bracket attached to the dash
and supported at upper end by a bracket
attached to the intake manifold. A throttle
operating lever on upper end of equalizer shaft
is connected by a rod and ball joint to the
.hrottle shaft lever on carburetor. The throttle
return spring is connected to the throttle
oper-
ating lever on equalizer shaft and to a boss on
intake manifold. See figure 3-4.
On cars equipped with Dynaflow
Drive,
a
dash pot is included in the throttle control link-
age to prevent engine stalling when the accel-
erator pedal is suddenly released while driving.
The dash pot cushions the closing of the throttle
to prevent sudden shut off. The dash pot oper-
ating lever and adjusting screw are mounted
on the lower end of accelerator equalizer shaft
so that the adjusting screw contacts the plunger
of dash pot, which is mounted on the equalizer
shaft lower bracket. A pipe connects the dash
pot to the intake manifold. The dash pot action
is controlled by a spring and vacuum operated
diaphragm, ball check valve, and a calibrated
bypass bleed.
3-3 DESCRIPTION OF INTAKE AND
EXHAUST SYSTEM
a. Intake and Exhaust Manifolds
The intake and exhaust manifolds are sep-
arate units joined together by a valve body
through which hot exhaust gasses may be
directed into a heat jacket cast on the intake
manifold to heat the area below the carburetor.
Figure 3-!i-Fuel Distribution Through Intake Manifold
The intake manifold is of dual type with the
carburetor mounted at the
middle.
The outside
barrel of the carburetor feeds into the outside
branch of the manifold to supply fuel to Nos
.
1, 2, 7, and 8 cylinders while the inside barrel
feeds into the inside branch to supply fuel to
Nos. 3, 4, 5, and 6 cylinders. See figure 3-5.
b. Intake Manifold Heat Control
The amount of heat supplied to the intake
manifold below the carburetor is regulated in
accordance with operating requirements by
means of the exhaust manifold valve. The valve
is controlled by a bi-metal thermostat wound
around the valve shaft so as to act as a spring
to close the valve when engine is cold. The
inner end of the thermostat engages a slot in
valve shaft and the hooked outer end engages
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