PUMP CIRCULATING

TM 10-3930-623-12

is circulated over the radiating surface by an engine-

upper connection. The radiator core divides the water

driven fan. The heat is carried away by this air stream.

into thin streams which flow into the bottom tank. In

Liquid cooling systems usually are designed to maintain

passing through the core, the water gives up heat,

a coolant temperature of about 180 degrees F. It is

transferring it through the metal conductors of the core to

desirable that normal operating temperatures be

the air stream blown through the core by the fan. An

reached as quickly as possible.

In liquid cooling

overflow pipe connected to the upper tank permits

systems, the circulation of the water can be delayed by

excess water or steam to escape.

A baffle plate

means of a thermostatically opened valve until normal

soldered inside the upper tank above the radiator-intake

temperatures are reached.

opening directs the flow of the water toward the radiator

core.

4-26. PUMP CIRCULATING

SYSTEM. The pump

circulating system uses a centrifugal pump to circulate

4-28. FAN. The fan is centrally located ahead of the

the water, to provide efficient cooling. The water pump,

radiator core and forces the air through the radiator.

driven by a V-belt, maintains circulation in the cooling

system.

4-29. THERMOSTAT.

Normal minimum water

temperatures in the cooling system are automatically

4-27. RADIATOR. The purpose of the radiator is to cool

maintained by a thermostatic valve that remains closed,

water received from the engine. The radiator consists of

to prevent coolant circulating through the radiator, until

an upper and lower tank and a core. In order to provide

the

rapid dissipation of heat, the radiator is made of copper.

Water from the engine enters the radiator through the

Figure 4-3. Wiring Diagram

4-4