TM-9-2320-260-34-2
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 2 OF 2
JULY 1994
TM-9-2320-260-34-2 - Page 729 of 863
TM 9-2320-260-34-2
17-12. 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
lNITIAL SETUP
APPLICABLE MODELS
All
TEST EQUIPMENT
24-volt DC power source
Fuel container
Coolant container (5 gal.)
Test stand
Thermometer (Appendix B, Item 147)
Flowmeter (Appendix B, Item 146)
Multimeter (Appendix B, Item 115)
TOOLS
General mechanic’s tool kit
(Appendix B, Item 1)
Tool kit, electrical (Appendix B, Item 106)
MATERIALS/PARTS
Four screw-assembled lockwashers
(Appendix D, Item 405)
Screw-assembled lockwasher
(Appendix D, Item 390)
Antifreeze (Appendix C, Item 4)
REFERENCES
TM 9-2320-260-20
TM 9-2320-260-34P-2
EQUIPMENT CONDITION
Engine coolant heater removed
(TM 9-2320-260-20).
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.
●
Do not handle hot heater with bare hands,
wear hand protection at all times.
●
Do not remove heater from test equipment
until cool.
●
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 to personnel and damage to equipment.
●
Do not handle hot heater with bare hands; wear hand protection
at all times. Failure to do so may cause injury to personnel.
●
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
●
Perform “preparation” subtask before preforming 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 restric-
tion thermostat are set for temperatures above the boiling point
of water.
Connect coolant heater (14) to test equipment using schematic on next page.
17-28
1 .
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