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 458 of 1313

CONTAMINATED COOLANT - Continued

d.

Inspect coolant for evidence of rust, engine oil, or transmission oil in coolant.

CONDITION/INDICATION

WHAT TYPE OF CONTAMINATION IS PRESENT?

DECISION

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

0233),

M939A2 (Volume 2, WP

0229), or aftercooler (Volume 2, WP

0299). Go to Step (2) to verify problem is solved.

YES - Transmission oil present in coolant. Repair or replace transmission oil cooler

M939/A1 (Volume 3, WP

0380), M939A2 (Volume 3, WP

0383). Go to Step (2) to verify problem is solved.

YES - Evidence of rust is present in coolant. Drain and flush cooling system (Volume 2, WP

0287). Go to

Step

(2) to verify problem is solved.

NO - Go to Step (2) to verify problem is solved.

STEP

2.

IS YOUR ORIGINAL COOLANT CONTAMINATION PROBLEM STILL PRESENT?

a.

Ensure vehicle is returned to normal operating condition.

b.

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

CONDITION/INDICATION

IS YOUR ORIGINAL COOLANT CONTAMINATION PROBLEM STILL PRESENT?

DECISION

YES - Notify supervisor.

NO - Problem fixed.

END OF WORK PACKAGE

TM 9-2320-272-23-1

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