Section IX. MAINTENANCE OF COOLING SYSTEM

TM10-3930-242-12

TA031848

Figure 4-10. Fuel filter service.

Section

IX.

MAINTENANCE

COOLING

SYSTEM

WARNING

is drawn from the bottom of the radiator by the

Drycleaning solvent, P-D-680, used to

water pump. During the warm-up period, when

clean parts is potentially dangerous to

coolant temperature is below normal, the coolant is

personnel and property. Do not use near

restricted by the thermostat. A bypass tube con-

open flame or excessive heat. Flash point

netted between the thermostat housing and the

of solvent is 138F.

water pump provides circulation within the engine.

As the coolant temperature rises above 160 to 170

4-23. General

F., the thermostat valve opens, restricting the

The diesel engine is cooled by circulating the engine

bypass system, and coolant is circulated through

coolant through the radiator, transmission heat

the radiator. This section contains information for

exchanger, engine block, and cylinder head. Coolant