Cooling System; General; Radiator - Kubota EA330-E4 Series Workshop Manual

EA330-E4, WSM

4. COOLING SYSTEM

[1] GENERAL

[2] RADIATOR

This engine employ a pressurized radiator natural
convection cooling system.
Cooling by the radiator (1) and radiator fan (2)
increases in specific gravity. And it absorbs combustion
heat of the cylinder liner (5) and cylinder head (3) and
friction heat generated from moving parts to cool them.
Then, coolant moves upward, as the water absorbs
heat and decreases in specific gravity.
The heated water is cooled again by the radiator.
Thus, the coolant circulates naturally to cool the engine.
(1) Radiator
(2) Radiator Fan
(3) Cylinder Head
The radiator adopted is of a plate fin type which is
durable and resistant to pressure, and has good heat
transfer proper ties. As it passes through the radiator
core, coolant is cooled by air from outside, and is again
circulated to the engine body.
The radiator core is composed of a tube (1), through
which water flow, and cooling fins (2). Both of the
components are formed of thin copper plate, etc. which
gives good heat transfer. Cooling air passing between
the fins helps coolant in the tube to give off heat.
(1) Tube
1-M13
ENGINE
(4) Cylinder Block
(5) Cylinder Liner
9Y1211018ENM0022US0
(2) Cooling Fin
(Waved Plate Fin)
9Y1211018ENM0023US0
KiSC issued 05, 2015 A