POWERPLANT HEATER TEST.

TM 9-2320-209-34-2-3

21-5. POWERPLANT HEATER TEST.

No special tools required

TOOLS:

None

SUPPLIES:

PERSONNEL:

One

CONDITION: Truck parked, engine off, handbrake set.

EQUIPMENT

a. Preliminary Procedure. Remove power plant heater. Refer to para 21-6.

Testing.

WARNING

Smoking, sparks or open flames are not allowed

within 50 feet of work area during this task.

Fuel can explode, causing injury to personnel

and damage to equipment.

Exhaust gases of any fuel are very poisonous.

Be sure exhaust is directed out of work area.

Be sure work area is well ventilated. Failure to

do so could result in injury or death to personnel.

CAUTION

Be sure test stand is equipped with proper con-

trol box. Proper control box is pn G-701633.

Damage to equipment will result if improper con-

trol box is used. Test stand must also be equipped

with a coolant container of about five-gallon capac-

ity. Container should be higher than heater. Con-

tainer must be vented. Coolant used must be of

same type as used in engine. Pure water cannot

be used. Failure to use proper coolant could cause

overheating and improper operation of thermostats,

damaging heater.

NOTE

A fuel burning coolant heater test stand and stop

watch is needed to perform these tests. Such a

test stand can be fabricated. Refer to ST 9-194.

(1) Fuel control valve.

CAUTION

Fuel flow and leak tests must be done with fuel

control valve in the position it normally operates.

Fuel used must be of the type normally used.

Failure to do this could result in a wrong measure-

ment, causing serious damage to equipment.