TM-5-3805-254-14-P-2

TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)

JUNE 1980

TM-5-3805-254-14-P-2 - Page 247 of 894

MOTOR TRUCK SERVICE MANUAL

COOLING SYSTEM

GENERAL

9. When the vehicle is equipped with a heater

connected to the cooling system, flush the

heater, following same procedure as for radiator

core.

10. After completing the flushing operation, clean out

radiator overflow pipe, inspect the water pump,

clean the thermostat and the radiator cap control

valves.

Check thermostat for proper operation

before installation.

(See "Thermostat".)

11. Blow insects and dirt from radiator core air

passages, using water, if necessary, to soften

obstructions.

Test Equipment

To aid the service man in maintaining the cooling

system at top efficiency, various items of test equipment

are available.

Among these are the Cooling System

Pressure Tester and the Hydrometer.

1. Cooling System Pressure Tester (Fig.

6)- This

equipment may be used in detecting the hard to

find leaks in the cooling system. Any leak from

cracked cylinder heads, warped cylinder heads

or blown gaskets whether internal or external

can be located easily and in a short time with the

pressure tester.

Adapters are available with the

tester which permit the testing of radiators on

trucks having the cab forward or cab over engine

design (Fig.

6).

Pressure caps can also be

tested with the pressure tester.