TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 457 of 1313
CONTAMINATED COOLANT - Continued
STEP
1.
WHAT TYPE OF CONTAMINATION IS PRESENT?
a.
Check engine oil cooler, transmission oil cooler, and aftercooler for leaks.
NOTE
During engine operation, oil pressure will be higher than coolant pressure. A leak in oil
cooler will show oil in coolant. After engine is shut down, residual pressure in cooling
system will cause coolant to leak into oil.
b.
Operate vehicle to normal operating temperature.
WARNING
Extreme care should be taken when removing surge tank filler cap if temperature gauge
reads above 175°F (79°C). Steam or hot coolant under pressure may escape rapidly or
cause burns. Failure to comply may result in injury or death to personnel.
c.
Wait for engine to cool and remove surge tank filler cap.
T1014DAA
Figure 1.
Surge Tank.
TM 9-2320-272-23-1
0030
0030-2
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