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ENGINE FUEL AND EXHAUST SYSTEMS
DESCRIPTION
3-3
bowl and a strainer which may be removed for
periodic cleaning. See figures 3-11 and 3-12.
The incoming gasoline flows into the sediment
bowl and then flows upward through the
strainer and into the carburetor.
c. Carburetor and Automatic Choke
Assembly
Engines on all series are equipped in pro-
duction with either Stromberg or Carter carbu-
retors of the dual-barrel down draft type.
Either make of carburetor is considered "stand-
ard" and it is not intended that these units be
interchanged to provide "optional" equipment.
The carburetor assembly incorporates an
automatic choke and an accelerator vacuum
switch. The construction and operation of the
Carter carburetor and choke assembly is de-
scribed in Section 3-E (par. 3-21 and 3-22) and
the Stromberg assembly is described in Section
3-F (par. 3-28 and 3-29). The accelerator
vacuum switches on both carburetors are
described in Section 10-E (par. 10-32 and
10-33) .
A thick fibre gasket is used between the
carburetor and the intake manifold to insulate
the carburetor from the heat of the manifold.
functions as a flame arrester in event of "back-
fire" through the intake system.
Figure 3.2-Air Cleaner and Silencer-Serl.. 70
The air cleaner consists of a sump containing
oil and a cleaner element containing a filtering
mesh which nests down in the sump. On Series
~0-50
engines, the silencer rests on top of the
cleaner element and is connected to the car-
buretor by a sheet metal elbow. See figure 3-1.
On Series 70 engines, the silencer is incorpo-
rated in the elbow which connects the cleaner to
the carburetor. See figure 3-2. A bolt and wing
nut holds the cleaner and silencer or elbow
together.
SilENCER
CLEANER
ELEMENT
1
t
.Ir~;w:p
~o;;;;;;:;l~-Oll
lEVel
Figure 3-1-Air Cleaner and Intake Silencer-S.ie. 40-50
d. Air Cleaner and Intake Silencer
All series engines are equipped with heavy
duty oil bath air cleaners combined with intake
silencers. The air cleaner removes abrasive
dust and dirt from the air before it enters the
engine through the carburetor. The intake
silencer reduces to a very low level the roaring
noise made by the air as it is drawn through
the intake system. The cleaner and silencer also
Figure 3-3-Air Cleaner Actlon-Serie. 40-50
The sump ot air cleaner must be filled to oil
level line with one pint of S.A
.E.
50 engine oil.
Incoming air passes downward through the
annular passage "A" between the oil sump and
cleaner element until it strikes the shelf on oil
sump at "B", where it is suddenly reversed and
directed upward into and through the cleaner
element filtering mesh "C". The perforated
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