Section II. PREVENTIVE MAINTENANCE

Table 2-1. Special Tools, Test, and Support, Equipment

Reference

Item

FSN or

Use

Fig.

Item

No.

Reference No.

Fig

Para No.

No.

2-7a

TESTER: thermostat

Temperature control thermostat and

2-1

indicator

TESTER: cooling

2-9d, 3-22

system

Test radiator caps

2-1

2-17d, 3-18a

TESTER: flo

4910-015-2395

Test for radiator blockage

2-1

3-8b

GUN: flushing

4910-449-6790

Cleaning radiator and engine block

2-1

3-21e

TESTER: combustion

Test for combustion leakage

2-1

3-9b

VAT: cleaning

Cleaning radiator

2-1

3-8a, 3-14

BOOTH: spray

4940-078-4126

Painting and flushing radiator,

2-1

3-42e

STAND: radiator test

4910-078-9190

Radiator testing and repair

2-1

3-39a

PRESS: arbor

3444-449-7295

Straightening radiator cores

2-1

2-22, 2-15a

TOOL cleaning

2815-494-8257

Removing debris from radiator cooler

2-1

fins.

3-19d

SET: plug

4910-273-3660

Radiator testing

2-1

Section II. PREVENTIVE MAINTENANCE

2-3.

General

2-4.

Engine Cooling Problems in Military

a. Cooling system preventive maintenance avoids

Operation

engine-cooling failures, operating difficulties, and loss of

Special requirements of military engines and severe

equipment use. Neglect of cooling system preventive

conditions of transport and combat operation make It

maintenance services often results in avoidable work,

necessary that the engine cooling system be maintained

expense, and time required for corrective repairs and

as closely as possible to maximum efficiency at all times.

replacements. Tools or replacement parts are not always

Many military-vehicles are powered with comparatively

readily available for emergency corrective services, and

large engines which develop proportionately large

engine-cooling failures may occur In situations when it is

amounts of heat that must be carried off. Also, cooling is

Inconvenient or even impossible to perform corrective

often made more difficult by the presence of air flow

repair work. However, the most serious penalty for

obstructions necessary for protection. Weather conditions

neglecting cooling system preventive maintenance

from the heat of the desert to the bitter cold of the Arctic.

services are operating difficulties, loss of mobility, failure of

Power requirements, which range from emergency high

mission and the serious effect such failure may have on

speeds on surfaced roads to heavy uphill hauling through

critical military operations,

deep mud, add further to the problem of engine cooling.

At the same time, military operating conditions, severe

b. Practically all cooling system troubles can be

shocks, vibration, flying debris, sand and dust. exposure,

detected by the driver in their early stages before they

and accidental and combat damage, cause rapid

seriously affect vehicle operation and they are still easy to

deterioration of the cooling system and loss of cooling

correct. For the stationary engine operator or driver the

efficiency. To keep the cooling system constantly in repair

two most important indications are coolant operating

and in best working order requires the most careful

temperature and coolant level. Therefore, preventive

attention to periodic preventive maintenance services by

maintenance services to the cooling system should be

the organizational mechanic.

concentrated on these two first requirements. While all

other preventive maintenance services, such as checks for

2-5.

Leakage

leakage or defective mechanical condition of parts, are

a. Causes Leakage is probably more common in

also necessary, these conditions are nearly always

the vehicle cooling system than In any other liquid-carrying

indicated by the engine temperature gage, by level of the

unit, due to the stresses and strains set up in joints and

coolant in the radiator, or by both.

connections by wide changes In coolant and metal

temperatures, especially during cold-weather operation.

Engine vibration, road

2-4