Water Pump; Thermostat; Radiator - Kubota WG1605-G-E3 Workshop Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, WSM

[2] WATER PUMP

[3] THERMOSTAT

[4] RADIATOR

The water pump is driven by the crankshaft and a V
belt. The rotating impeller (4) in the water pump sucks
the coolant from the radiator and sends it into the water
jacket in the cylinder block.
The mechanical seal (3) prevents the water from
entering the bearing unit (1).
(1) Bearing Unit
(2) Water Pump Body
The thermostat is of the wax pellet type.
The thermostat controls the flow of the coolant to the
radiator to keep the proper temperature.
The case, which serves as a valve seat, has a
spindle inserted 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 temperature (lower than valve opening
temperature (at beginning))
The valve (2) is seated by the spring (7) and the
coolant circulates in the engine through the water return
hose without running into the radiator. Only the air in the
water jacket escapes to the radiator through the leak
hole of the thermostat.
At high temperature (higher than valve opening
temperature (opened completely))
As the coolant temperature rises, the wax in the
pellet (3) turns liquid and expands, repelling the spindle,
which causes the pellet to lower. The valve (2) opens to
send the coolant to the radiator.
(1) Seat
(2) Valve
(3) Pellet
(4) Spindle
The radiator core consists of coolant carrying tubes
(1) and fins (2) meeting at a right angle with the tubes.
The fin is a louverless, corrugated type which is light in
weight, high in heat exchange ratio and less apt to clog.
The coolant in the tubes is cooled by the air flowing
through the tube walls and fins.
(1) Tube
(2) Fin
1-M10
ENGINE
(3) Mechanical Seal
(4) Impeller
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(5) Synthetic Rubber
(6) Wax (Solid)
(7) Spring
(8) Wax (liquid)
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A: Cooling Air
9Y1210318ENM0025US0
KiSC issued 01, 2012 A