TM 9-2320-260-34-2
17-12. ENGINE COOLANT HEATER TESTING
THIS TASK COVERS:
e. Blower Motor Test
a. Preparation
f. Restriction Thermostat Test
b. Igniter Test
c. Flame Detector Switch Test
g. Overheat Switch Test
h. Test Equipment Removal
d. Fuel Control Valve Test
lNITIAL SETUP
REFERENCES
APPLICABLE MODELS
TM 9-2320-260-20
All
TM 9-2320-260-34P-2
TEST EQUIPMENT
EQUIPMENT CONDITION
24-volt DC power source
Engine coolant heater removed
Fuel container
(TM 9-2320-260-20).
Coolant container (5 gal.)
Test stand
GENERAL SAFETY INSTRUCTIONS
Thermometer (Appendix B, Item 147)
q Keep fire extinguisher nearby when working
Flowmeter (Appendix B, Item 146)
with open fuel lines.
Multimeter (Appendix B, Item 115)
q Do not perform procedure near open flame,
TOOLS
smoking, or sparking object.
q Do not perform procedure in enclosed areas.
General mechanic's tool kit
q Do not handle hot heater with bare hands,
(Appendix B, Item 1)
wear hand protection at all times.
Tool kit, electrical (Appendix B, Item 106)
q Do not remove heater from test equipment
MATERIALS/PARTS
until cool.
Four screw-assembled lockwashers
Screw-assembled lockwasher
Antifreeze (Appendix C, Item 4)
Do not perform this procedure while smoking or within 50 feet of
q
sparks or open flame. Fuel is flammable and can explode easily,
causing injury to personnel and damage to equipment.
q Do not handle hot heater with bare hands; wear hand protection
at all times. Failure to do so may cause injury to personnel.
q Exhaust gases can kill. Do not perform this task in enclosed
areas. Ensure work area is well-ventilated and exhaust fumes
are directed away from test area.
NOTE
q Perform "preparation" subtask before preforming any test and
perform "test equipment removal" after each test is complete.
q Heater must be tested in same position as mounted on vehicle.
q Use proper coolant required for engines which are being heated.
Water cannot be used because the overheat switch and restric-
tion thermostat are set for temperatures above the boiling point
of water.
1 . Connect coolant heater (14) to test equipment using schematic on next page.
17-28
