Industrial 1.6L Engine Cooling 2-21
Water Pump Description
The die–cast pump is a centrifugal vane impeller type.
The impeller turns on a steel shaft that rotates in a
permanently lubricated ball bearing.
The pump inlet connects to the bottom of the radiator
by a rubber hose. Coolant passes from the pump
through the coolant passages in the block and cylinder
head. This is done in order to absorb and carry away
excess engine heat.
Thermostat Description
A pellet–type thermostat in the coolant outlet passage
controls the flow of the engine coolant. This allows
proper engine warm–up and regulates coolant tem-
perature. A wax pellet element in the thermostat
expands when heated and contracts when cooled. The
pellet connects through a piston to a valve. When the
pellet heats, the valve opens. As the pellet cools, the
contraction allows a spring to close the valve. The valve
remains closed while the coolant is cold. This prevents
circulation of coolant through the radiator.
When the engine warms and the thermostat valve
opens, coolant flows through the radiator. In the
radiator, heat is exchanged through the radiator into the
surrounding air. This opening and closing of the ther-
mostat permits enough coolant to enter the radiator in
Special Tools and Equipment
1409
1405
Tool Number/Description
Illustration
J 223688
Coolant Tester
Fahrenheit Scale
J 24460-01
Radiator Pressure Tester
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