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 402 of 1313

FIELD MAINTENANCE

EXHAUST COLOR BLUE 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

Volume 2, WP

0232

Volume 2, WP

0250

Volume 5, WP

0820

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

EXHAUST COLOR BLUE DURING NORMAL OPERATION

NOTE

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

procedure will check for the correct engine oil and fuel.

STEP

1.

IS CORRECT OIL IN ENGINE?

Check that engine oil grade is correct for vehicle use and climatic conditions (Volume 5, WP

0820).

CONDITION/INDICATION

IS CORRECT OIL IN ENGINE?

DECISION

YES - Go to Step (2).

NO - Replace engine oil and filter (Volume 2, WP

0232). Go to Step (3) to verify problem is solved.

STEP

2.

IS CORRECT FUEL BEING USED?

Check that engine fuel grade is correct for vehicle use and climatic conditions (TM 9-2320-272-10).

CONDITION/INDICATION

IS CORRECT FUEL BEING USED?

DECISION

YES - Notify supervisor. It is possible that another troubleshooting work package applies.

NO - Drain fuel system (Volume 2, WP

0250) and replace with correct grade of fuel (TM 9-2320-272-10). Go to

Step (3) to verify problem is solved.

TM 9-2320-272-23-1

0022

0022-1