6-2
COOLING
SYSTEM
COOLING
SYSTEM
DESCRIPTION
The engine is cooled by engine coolant set in forced circulation through jackets formed in the cylinder and
cylinder head, and through the radiator. For the water pump, a high-capacity centrifugal
pump
is used. The
radiator is a tube-and-fin type
made
of aluminum material, which is characterized by lightness in weight and
good
heat dissipation.
The thermostat is a wax pellet type, complete
with
a valve as the
means
of temperature-dependent control
over the flow of engine coolant 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 the closed condition, so that engine coolant recir-
culates through the route comprising pump, engine, by-pass hole of the thermostat and radiator in the reg-
ulated condition.
As the coolant temperature rises to about
75°C
(167°F)
and the thermostat valve unseats, the normal cool-
ant flow is established. At about
90°C
(194°F)
of coolant temperature the thermostat becomes completely
open
and the most of heat is released to the atmosphere through the radiator core.
® Radiator
© Thermostat
0 Water
pump
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