Section IX. MAINTENANCE OF COOLING SYSTEM

TM 10-3930-634-12

Figure 4-9.

Section IX. MAINTENANCE OF COOLING SYSTEM

the coolant temperature rises above 160 to 170F., the

4 - 2 3 . General

thermostat valve opens to restrict the bypass system

The diesel engine is cooled by circulating the engine

and circulate coolant through the radiator. This section

coolant through the radiator, transmission heat ex-

contains information on the maintenance of those com-

changer, cylinder block, and cylinder head. Coolant is

ponents of the cooling system which is the respon-

drawn from the bottom of the radiator by the water

sibility of organizational maintenance personnel.

pump and circulated through the heat exchanger,

engine block and cylinder head. During warmup

4-24. Thermostat Housing and Thermostat

period, when coolant temperature is below normal, the

a. Removal.

coolant is restricted at the thermostat. A bypass tube

(1) Drain the cooling system to below the ther-

connected between the thermostat housing and the

mostat housing by opening the drain cock at the bottom

water pump provides circulation within the engine. As