1-M5
ME8200, ME9000, WSM
ENGINE
4. COOLING SYSTEM
W1013737
The cooling system cools the engine while it is running to prevent overheating and maintain a proper operating
temperature.
Kubota engines are used pressurized forced-circulation type.
This system consists of a radiator (1), water pump (2), cooling fan (3), thermostat (4) and coolant temperature
sensor (some models).
The coolant is cooled through the radiator core, and the fan set behind the radiator pulls cooling air through the
core to improve cooling.
When the coolant in the engine is at a low temperature, the thermostat valve is closed so that the coolant is
circulated in the engine through the bypass pipe.When the temperature of the coolant becomes the valve opening
temperature of thermostat (4), the thermostat (4) opens the valve to return the heated coolant to the radiator (1).
The water pump (2) sucks the cooled water, forces it into the cylinder block (6) and draws out the hot water.
Some engines employ the bottom bypass system to improve the cooling performance of radiator and the three step
valve opening type thermostat to reduce thermal shock radically.
(1) Radiator
(2) Water Pump
(3) Cooling Fan
(4) Thermostat
(5) Cylinder Head
(6) Cylinder Block
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