Thermostat - Kubota Z400-B Handbuch

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CU12FU48
[2] THERMOSTAT
The thermostat is of the wax pellet type.
The thermostat controls the flow of the cooling water to the
radiator to keep the proper temperature.
The case, which serves as a valve seat
(1),
has a spindle in·
serted in the pellet (3) which is installed to the valve (2).
The spindle is covered with the synthetic rubber (5) in the
pellet. The wax is charged between the pellet and the rubber .
• At low temperatures (lower than 82°C (180° F))
The valve (2) is seated by the spring (7) and the cooling
water circulates in the engine through the water return pipe
without running into the radiator.
Only the air in the water jacket escapes to the radiator
through the leak hole (8) on the thermostat.
• At high temperature (higher than 82°C (180° F))
As the water temperature rises, the wax in the pellet (3)
turns liquid and expands, repelling the spindle, which causes
the pellt to lower.
The valve (2) opens to send the cooling water to the radiator.
(1 ) Seat
(2) Valve
(3) Pellet
(4) Spindle
(5) Synthetic Rubber
(6) Wax (solid)
(7)
Spring
(8) Leak Hole
(9) Wax (liquid)
M-21