Radiator - TM-5-4320-243-150064

and outlet headers, and the outlet elbow. Correct engine

(9) Allow the engine to cool. Fill the cooling

operating temperature is maintained by the two

system with clean, fresh water.

thermostats and by the fan which circulates air through

(10) Start the engine and run it until the

the radiator. The thermostats control the flow of coolant

coolant reaches 180 F.

through the radiator. The shutter assembly, when

(11) Stop the engine, repeat step (2) above

closed, blocks the flow of air through the radiator. When

and drain the cooling system.

the coolant temperature reaches 160F the shutter

(12) Repeat steps ( 9 ), ( 10 ), and ( 11 ) above

begins to open, and is fully open at 185F. A manual

until the water runs clear.

arm is provided on the shutter thermostat housing to

(14) Fill the cooling system to the proper

open the shutter at temperatures below the shutter

operating level with the proper coolant (pare 2-3). Start

thermostat setting.

the engine and run it until the coolant reaches 180 F.

Observe the coolant level and add water if required.

3-56.

Radiator

b. Inspect the radiator core, hoses and connections

for leaks and air blockage.

Service the radiator assembly (fig. 3-29) as follows:

a. lush the radiator as indicated below:

(1) Start the engine and run at slightly faster

than idling speed until the water temperature gage

registers 180F. Stop the engine.

(2) Remove the radiator cap, and the radiator

drainplug, open the crankcase draincock and drain the

coolant into suitable containers. Close the radiator

drainplug and crankcase draincock.

(3) Allow the engine to cool. Refill cooling

system with clean, fresh water and the -recommended

quantity of an approved cooling system cleaning

compound. Install radiator cap.

(4) Start the engine and run it slightly faster

than idling speed for at least 30 minutes after operating

temperature is reached.

(5) Stop the engine. Repeat step (2) above

and drain the cooling system.

Note

Always neutralize the cooling system

with

approved

neutralizing

compound after a cleaning compound

has been used.

(6) Allow the engine to cool. Fill the cooling

system with the clean, fresh water and an approved

Figure 3-29. Radiator service.

neutralizing compound. Install the radiator cap.

3-57. Water Pump

(7) Start the engine and run it for at least 10

a. Service the water pump (fig. 3-30) by adding

minutes at slightly faster than idling speed after the

lubricant as directed in the current lubrication order (fig.

coolant has reached a temperature of 180F.

3-1).

(8) Stop the engine and repeat step (2) above

b. Remove and install as shown by figure 3-30.

and drain the cooling system.

3-34