M.3
COOLING
SYSTEM
68
mm
STROKE
SERIES
WSM,
01
I61
E]
COOLING
SYSTEM
[I]
GENERAL
(1)
Radiator
(2)
Suction
Fan
(3)
Thermostat
(4)
Water Pump
(5)
Cylinder Head
(6)
Cylinder
Block
The cooling system consists of
a
radiator
(1)
(not
included in the basic engine), centrifugal water
pump
(4),
suction fan
(2)
and thermostat (3).
The
water
is
cooled through the radiator core, and
the fan
set
behind the radiator pulls cooling air
through the core to improve cooling.
The water pump sucks the cooled water, forces
it
into the cylinder block and draws out the hot water.
[Z]
WATER
PUMP
Then the cooling
is
repeated. Furthermore, to
control temperature of water,
a
thermostat
is
provided in the system. When the thermostat opens,
the water moves directly to radiator, but when
it
closes, the water moves toward the water pump
through the bypass between thermostat and water
pump. The opening temperature of thermostat
is
approx.
71OC
(16OOF).
3109F031
Bi'
The water pump
is
driven by the crankshaft
via
a
V-belt. Water cooled in the radiator
is
sucked into
the water pump from
its
lower portion and
is
sent
from the center
of
the water pump impeller
(4)
radially outward into the water jacket in the
crankcase.
(1)
Bearing Unit
(2)
Water Pump Body
(3)
Mechanical Seal
(4)
Water Pump Impeller
M-I
5
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