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 426 of 1313

FIELD MAINTENANCE

ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Test Set, Electronic Systems

(Volume 5, WP

0826, Table 1, Item 51)

Personnel Required

(2)

References

Point to Point Schematics

TM 9-2320-272-10

Volume 2, WP

0288

References (cont.)

Volume 2, WP

0289

Volume 2, WP

0295

Volume 2, WP

0296

Volume 2, WP

0298

Volume 2, WP

0334

Volume 3, WP

0447

Volume 3, WP

0448

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE

NOTE

Conduct these malfunction tests if engine does not reach normal operating temperature. This

procedure will check for proper thermostat and fan clutch operation.

TM 9-2320-272-23-1

0027

0027-1