5-2
COOLING
AND
LUBRICATION
SYSTEM
COOLING SYSTEM
DESCRIPTION
The engine
is
cooled
by
the forced circulation of engine coolant, using a high-capacity, centrifugal water
pump, through water jackets formed
in
the cylinder and cylinder head, and through the radiator. The tube-
and-fin type radiator
is
made of aluminum, which is characterized by lightness
in
weight and good heat dissi-
pation.
A
wax-pellet type thermostat
is
used to regulate the flow of engine coolant through the radiator. As the cool-
ant temperature rises to about 75°C (167°
F)
the thermostat valve unseats and a normal coolant flow is
established.
At
about 90°C (194°
F)
the thermostat becomes completely open and, as a result, heat
is
released to the atmosphere through the radiator core.
Referring
to
the following illustration, the thermostat is
in
the closed condition, so that engine coolant recircu-
lates through the route comprising the water pump, engine, by-pass hole of the thermostat and radiator
in
the regulated condition .
-L+-
- @
+-
-@
CD
Impeller
~
Radiator cap
@ Radiator
@ Thermostat
@ Cooling fan thermo-switch
@ Coolant temperature switch
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