ENGINE
The thermostat is wax pellet type, which controls the
flow of the cooling water to the radiator to keep the
proper temperature. The case has a seat (1) and
the pellet has a valve (2). The spindle attached to
the case is inserted into the synthetic rubber in the
pellet. The pellet is charged with wax.
(A) At low temperature(lower than 71
o
C ( 1 6 0
o
F) )
The valve (2) is seated by the spring (7) and the
cooling water circulates in the engine through the
water return pipe but does not enter the radiator.
(B) At high temperature(higher than )
As the water temperature rises, the wax in the pellet
(3) turns liquid and expands, repelling the spindle.
The pellet lowers and the valve (2) opens to send
the cooling water to the radiator.
The radiator core consists of water carrying tubes
(2) with fins (3) at a right angle to it. The water in the
radiator is cooled by the air flowing through between
the tube wall and the fin.
(1) Cooling Air (3) Fin
(2) Tu b e
The pressure type cap is installed on the radiator,
which prevents the pressure difference between the
inside and the outside of the radiator from deforming
the radiator.
(A) At high pressure
(higher than 88kPa(0.9kgf/cm
2
, 13psi)
When the water temperature rises and the pressure in
the radiator increase above the specified pressure, the
pressure valve(1) opens to reduce the internal pressure.
(B) At low pressure
When the water temperature falls and a vacuum is
formed in the radiator, the vaccum valve (2) opens
to allow the air to enter the radiator.
(1) Cooling Air (2) Tu b e
C. THERMOSTAT
(1) Seat
(2) Valve
(3) Pellet
(4) Spindle
(5) Synthetic Rubber
D. RADIATOR
E. RADIATOR CAP
(6) Wax(solid)
(7) Spring
(8) Leak Hole
(9) Wax(liquid)
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