TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 1025 of 1417
CLEANING AND FLUSHING SYSTEM
Clean and flush radiator (Figure 1, Item 3) and cooling system with cleaning compound kit. Follow instructions
provided with kit.
END OF TASK
FILLING SYSTEM
Table
1.
Guide for Preparation of Antifreeze Solutions.
ETHYLENE-GLYCOL -60°F (-51°C) INHIBITED ML-A-46153
LOWEST EXPECTED
AMBIENT
TEMPERATURE
QUARTS OF
ANTIFREEZE
REQUIRED
ARCTIC GRADE ANTIFREEZE
-90°F (-68°C)
ML-A-11755
°F
°C
Freezing point of -90°F (-68°C).
Issued ready for use and must not
be mixed with any other liquid.
+20
-7
9
+10
-12
11-3/4
0
-18
16
-10
-23
19
-20
-29
20-1/2
-30
-34
23-1/3
-40
-40
25
-50
-46
22-26-1/2
-55
-48
28
Below -60
Below-51
Use arctic grade antifreeze
(-90°F)(-68°C)
CAUTION
When filling cooling system on M939A2 series vehicles, ensure drain valve on aftercooler is
open. Failure to do so may result in damage to equipment.
NOTE
The cooling system for the vehicles covered in this manual has a 47 qt (44.5 L) capacity.
1.
Fill cooling system with required amount of antifreeze and add water to full mark. Close aftercooler
(Figure 2, Item 3) drain valve (Figure 2, Item 4) when coolant starts running out of drain valve on M939A2
vehicles.
2.
Install filler cap (Figure 2, Item 1) on surge tank (Figure 2, Item 2).
3.
Start engine (TM 9-2320-272-10) and run at fast idle (800 to 1,000 rpm) until engine temperature reaches
185°F (85°C). At this temperature, thermostats should fully open.
TM 9-2320-272-23-2
0287
0287-4
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