ENGINE SYSTEMS. -726280043

TM 9-2320-364-20-1

Figure 1-6. Cooling System

a. Cooling System. The pressure-type cooling system (Figure 1-6) protects the engine by removing heat

generated during the combustion process. Pressure within the cooling system is regulated by a pressure release in the

radiator filler cap (1). The hot coolant flows from the engine (2) to the radiator tank (3) and through the radiator core

where a stream of air removes heat. This stream of air is drawn through the core by the fan. A water pump (4) draws

the coolant from the radiator and pushes it through the engine repeating the cooling process. Thermostats (5)

mounted in each coolant outlet elbow, remain closed until the coolant approaches a predetermined temperature at

which time they open. When the coolant temperature drops below the thermostat rating, they close. An air vent line

between the radiator and the water pump inlet removes air trapped in the engine when the cooling system is being

filled. An oil cooler (6) is mounted in the radiator lower tank.

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