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 404 of 1313

FIELD MAINTENANCE

EXHAUST COLOR WHITE DURING NORMAL OPERATION

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Personnel Required

(2)

References

Point to Point Schematics

References (cont.)

TM 9-2320-272-10

WP

0028

Volume 2, WP

0250

Volume 2, WP

0258

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

EXHAUST COLOR WHITE DURING NORMAL OPERATION

NOTE

Conduct these malfunction tests if exhaust smoke is white during normal operation. This

procedure will check for engine overheating and water in fuel.

STEP

1.

IS ENGINE ABOVE NORMAL OPERATING TEMPERATURE?

CAUTION

Thick white smoke indicates coolant is present in engine combustion chambers during

operation. When this condition is evident, shut down immediately and determine cause.

Continued engine operations may result in permanent damage to engine.

a.

Check engine temperature.

b.

Ensure engine temperature is within normal operating range 175°F to 200°F (79°C to 93°C).

CONDITION/INDICATION

IS ENGINE ABOVE NORMAL OPERATING TEMPERATURE?

DECISION

YES - Perform Engine Overheats troubleshooting (WP

0028).

NO - Go to Step (2).

TM 9-2320-272-23-1

0023

0023-1