Cub Cadet 8454 Service Manual page 36

CHAPTER 2 8454
C. THERMOSTAT
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 °C (160 °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 71 °C (160° F)). 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 cool-
ing water to the radiator.
D. RADIATOR
The radiator core consists of water carrying tubes (2)
with fins (3) at a right angle to it. The water in the radia-
tor is cooled by the air flowing through between the
tube wall and the fin.
E. RADIATOR CAP
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 radia-
tor.
(A) At high pressure
Higher than 88 kPa (0.9 kgf/cm
ant 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 coolant temperature falls and a vacuum is
formed in the radiator, the vacuum valve (2) opens to
allow coolant stored in the over flow tank to enter the
radiator.
2-14
K&T Saw Shop 606-678-9623 or 606-561-4983
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2
, 13 psi) when the cool-
(1) Seat
(2) Valve
(3) Pellet
(4) Spindle
(5) Synthetic Rubber
(1) Cooling Air
(2) Tube
(1) Pressure Valve
569W224A
(6) Wax (Solid)
(7) Spring
(8) Leak Hole
(9) Wax (Liquid)
569W225A
(3) Fin
569W226A
(2) Vacuum Valve
D569-W02 May-2003