5-1
COOLING
SYSTEM
COOLING SYSTEM
DESCRIPTION
The engine
is
cooled by coolant set
in
forced recirculation through jackets formed
in
the cylinder and
head, and through the radiator. For the water pump, a high-capacity centrifugal pump
is
used. For the
radiator, a tube-and-fin type aluminum
in
material, and
is
characterized by lightness
in
weight and good
heat dissipation.
The thermostat
is
of
.wax pellet type, complete with a
valve
as
the means
of
temperature-dependent con-
trol over the flow
of
water through the radiator. The
valve
is
actuated by the temperature-sensitive wax
contained
in
the pellet.
Referring
to
the following illustration, the thermostat
is
in
closed condition, so
that
water recirculates
through the route comprising pump, engine, by-pass holes
of
the thermostat and radiator
in
the regulated
condition.
As
the coolant temperature rises
to
50°C and the thermostat valve unseats, the normal water flow
is
estab-
lished. At about 65°C
of
rising coolant temperature, the thermostat becomes completely open and the
most of heat
is
released
to
the atmosphere through the radiator core.
Radiator cap
Inspection
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