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(2) The
gear driven
oil pump, lo-
cated
in the oil
base, draws
oil
through
an intake screen.
Oil is
forced to all main,
connecting rod
and camshaft bearings;
through jet
holes
in the
connecting
rods for
cylinder wall, piston and wrist pin
lubrication.
Drilled holes
in the
cylinder block provide
lubrication
for the valve tappets.
Oil is sup-
plied to the reversing gear through
a drilled
hole in
the end of
the
crankshaft.
Hydraulic
reversing
gears are separately lubricated from
their own oil supply.
(J)
All models using the full pres-
sure
system
are equipped
with an
oil pressure regulator which may be
adjusted
for proper
oil pressure.
See Table
4
for proper setting.
(4)
Six and
eight cylinder
models
and. the Super-Four models are equip-
ped with oil coolers.
Oil from the
oil
pump is circulated to the cooler
aDd cooled
by
water trom the engine
cooling system.
A
by-pass
(except
on Super-Foul' models) built into the
cooler
short circuits the
oil di-
rectly from the pump to the
oil
line
in
the
event
the
cooler
becomes
clogged.
4.
FUEL SYSTEM
The fuel
system
consists of
fuel
tank,
fuel
line,
strainer,
pump
(except on Blue Jacket Twin models),
carburetor,
flame
arrestor~
and
intake manifold.
Gasoline from the
tank enters
the fuel pump
through
the strainer
and into the carbure-
tor where it is vaporized and drawn
through the intake manifold, through
the valves, and into the combustion
chamber of the cylinder.
a. Fuel Pump
(1) The purpose of the fuel pump is
~o
supply an adequate amount of gaso-
line from the tank to the carburetor
to meet engine
requirements at all
speeds. This pump is of the diaphragm
type and is
operated by a
plunger
-40-
working
off
an eccentric
on
the
camshaft.
(2)
As the high point of the cam is
reached, the plunger is forced down,
causing a vacuum above the diaphragm.
The vacuum draws
gasoline from the
tank,
through the inlet
valve and
into the fuel chamber of the
pump.
The return stroke releases the com-
pressed diaphragm spring, expelling
gasoline
through the
outlet valve
into the carburetor bowl.
(J)
After several diaphragm strokes,
the carburetor
bowl fills
and its
float mechanism rises, thus seating
the needle valve
and stopping fur-
ther passage of fuel from the pump.
With the carburetor bowl filled and
needle valve closed,
back pressure
is created
on the diaphragm.
i~7i
th
this back pressure on the
diaphragm~
the rocker arm
movement continues,
but is
taken
up by
the
linkage,
rather
than
being
transmitted to
the diaphragm.
As pressure reduces
in
the fuel chamber because of car-
buretor demands, the diaphragm will
take longer strokes"
Fuel
flow
is
thus maintained in
accordance with
engine operating conditionG.
b. Carburetor
The function
of the
carburetor is
to furnish
the correct
mixture of
gasoline
and air to the
engine
in
the proper proport ion for all opera-
ting
conditions,
idling
to
full
throttle.
To accomplish thiS,
the
gasoline is
accurately
metered at
all speeds,
atomized or
broken up
into
small
particles,
and
mixed
with air. The fuel is vaporized and
preheated
in the
intake
manifold
before being drawn into the cylinder
through the intake valve.
c. Flame Arrestor
A flame arrestor attached to the air
inlet of the
carburetor eliminates
the possibility of fire being caused
by backfiring through the carburetor.
A special
element,
consisting
of
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