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 286 of 1313

FIELD MAINTENANCE

ENGINE CRANKS BUT DOES NOT START

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

WP

0021

WP

0086

Volume 2, WP

0239

Volume 2, WP

0241

References (cont.)

Volume 2, WP

0243

Volume 2, WP

0251

Volume 2, WP

0254

Volume 2, WP

0258

Volume 2, WP

0259

Volume 2, WP

0260

Volume 2, WP

0263

Volume 2, WP

0264

Volume 2, WP

0265

Volume 2, WP

0266

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

ENGINE CRANKS BUT DOES NOT START

NOTE

Conduct these malfunction tests if engine fails to start. This procedure will check for the

emergency engine stop control not correctly set, air in fuel system, coolant in combustion

chambers, loose fuel supply line connections or fuel supply line at fuel filter head, leaking or

damaged primary fuel filter, contaminated fuel, low fuel supply or vacuum pressure, and an

empty ether cylinder. It also checks for a faulty fuel transfer pump, fuel supply line, starter

circuit, fuel filter, ether start system, thermal close valve, and ether atomizer. In addition, this

procedure checks for a clogged or dirty air intake stack, air cleaner element, fuel injector

supply line, fuel filter, fuel pump filter, thermal close valve tubing, and atomizer tubing.

TM 9-2320-272-23-1

0007

0007-1