TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 691 of 764
TM 9-2320-361-34
17-19. ENGINE COOLANT HEATER TESTING
THIS TASK COVERS:
a. Preparation
e. Blower Motor Test
b. Igniter Test
f. Restriction Thermostat Test
c. Flame Detector Switch Test
g. Overheat Switch Test
d. Fuel Control Valve Test
h. Test Equipment Removal
INITIAL SETUP
APPLICABLE MODELS
All
TEST EQUIPMENT
24-volt DC power source
Fuel container
Coolant container
(5gal.)
Test stand
Thermometer
Flowmeter
Multimeter (Appendix B, Item 3)
MATERIALS/PARTS
Antifreeze (Appendix C, Item 3)
REFERENCES
TM 9-2320-361-20
TM 9-2320-361-34P
EQUIPMENT CONDITION
Engine coolant heater removed
(TM 9-2320-361-20).
GENERAL SAFETY INSTRUCTIONS
●
Keep fire extinguisher nearby when working with
open fuel lines.
●
Do
not
perform
procedure near open flame,
smoking, or sparking object.
. Do not perform procedure in enclosed areas.
●
Allow time
for heater
to cool before removing from
test equipment.
a. Preparation
WARNING
●
Do not perform
this procedure while smoking or within 50 feet of
sparks or open flame. Fuel is flammable and can explode easily,
causing injury or death to personnel and damage to equipment.
●
Exhaust
gases can kill. Do not operate personnel heater in
enclosed areas. Ensure work area is well-ventilated and exhaust
fumes are directed away from test area.
NOTE
●
Perform “preparation” subtask before performing any test and
perform “test equipment removal” after each test is complete.
●
Heater
must be tested in same position as mounted on vehicle.
. Use proper coolant required for engines which are being heated.
Water cannot be used because the overheat switch and restriction
thermostat are set for temperatures above the boiling point of
water.
1. Connect coolant heater (13) to test equipment using schematic on next page.
NOTE
. Coolant container must be vented and raised above the test
apparatus in order for thermosyphon circulation to occur.
●
Fuel pump, fuel filter, heater, wiring harness, fuel tubing, control
box, and coolant must be the same type used on vehicle.
17-48
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