Westerbeke ATOMIC 4 User Manual

(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

Westerbeke ATOMIC 4 Specifications

General

Brand	Westerbeke
Model	ATOMIC 4
Category	Engine
Language	English