TM 9-2320-387-24-l
h-6
1. COOLING SYSTEM SERVICING
I
This task covers:
a. Depressurizing
b. Draining System
c. Preventive Cleaning
d. Filling System
INITIAL SETUP:
Tools
?&era1
mechanic’s
tool kit:
automotive (Appendix B, Item 1)
Maintenance and repair shop equipment:
automotive (Appendix B, Item 2)
Test Equipment
Radiator tester (Appendix B, Item 49)
Materials/Parts
Antifreeze
(Appendix
C, Item 15)
Manual References
TM 9-2320-387-10
TM 9-2320-387-24P
Manual References (Cont’d)
TM 750-254
TB 750-651
Equipment Condition
Hood raised and secured
(TM 9-2320-387-10).
General Safety Instructions
Do not remove surge tank filler cap before
releasing internal pressure.
Maintenance Level
Unit
a. Depressurizing
WARNING
Do not remove surge tank filler cap before depressurizing system
when engine temperature is above 190°F (88°C). Steam or hot
coolant under pressure may cause severe bums.
1.
If engine is hot, remove surge tank filler cap (1) by placing a thick cloth over cap (1). Press down and
turn counterclockwise to its first stop to release internal pressure.
2.
After pressure has escaped, press down and turn cap (1) counterclockwise again and remove.
b. Draining System
1.
If engine
is hot, depressurize
system
(see task a.).
NOTE
Have draidage container ready to catch coolant.
2.
Open drainvalve (4) and allow system to drain.
3.
Close drainvalve (4).
c. Preventive Cleaning
1.
For preventive cleaning, refer to TB 750-651.
2.
Test surge tank filler cap (1); refer to TM 750-234.
d. Filling System
NOTE
The cooling system for the vehicles covered in this manual has a
26 qt (24.6 L) capacity. Continue filling and allow air to escape.
Ensure surge tank coolant level is 3/4 full before securing filler cap.
1.
Ensure radiator drainvalve (4) is closed and heater control valve (3) is open (pull TEMP knob on
dash to MAX position).
3-110
