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 454 of 1313

LOSS OF COOLANT - Continued

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.

d.

Wait for engine to cool and remove surge tank filler cap, look for evidence of oil in coolant.

CONDITION/INDICATION

DO THE OIL COOLER OR AFTERCOOLER LEAK?

DECISION

YES - Coolant present in engine oil. Repair or replace aftercooler (Volume 2, WP

0299). Go to Step (4) to verify

problem is solved.

YES - Oil present in coolant. Repair or replace oil cooler M939/A1 (Volume 2, WP

0233),

M939A2 (Volume 2, WP

0229). Go to Step (4) to verify problem is solved.

NO - Notify supervisor. It is possible that another troubleshooting work package applies.

STEP

4.

IS YOUR ORIGINAL COOLANT LOSS PROBLEM STILL PRESENT?

a.

Ensure vehicle is returned to normal operating condition.

b.

Check to see if your original coolant loss problem still exists.

CONDITION/INDICATION

IS YOUR ORIGINAL COOLANT LOSS PROBLEM STILL PRESENT?

DECISION

YES - Notify supervisor.

NO - Problem fixed.

END OF WORK PACKAGE

TM 9-2320-272-23-1

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