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 453 of 1313
LOSS OF COOLANT - Continued
STEP
3.
DO THE OIL COOLER OR AFTERCOOLER LEAK?
a.
Check the 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.
T0401DAA
Figure 4.
Surge Tank.
c.
Remove oil dipstick and look for coolant in engine oil.
TM 9-2320-272-23-1
0029
0029-6
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