TM-9-2320-272-23-2

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-2 - Page 677 of 1417

PRIMING

1.

Loosen adapter (Figure 1, Item 6) and vent screw (Figure 1, Item 7) on fuel pump (Figure 1, Item 5).

NOTE

Perform Step (2) until all air is purged from fuel system.

2.

Press plunger (Figure 1, Item 3) on fuel transfer pump (Figure 1, Item 4) until air is purged from fuel system.

3.

Tighten vent screw (Figure 1, Item 7) and adapter (Figure 1, Item 6) on fuel pump (Figure 1, Item 5).

4.

Start engine (TM 9-2320-272-10).

NOTE

If engine fails to start, or runs rough, perform Steps (5) through (10).

5.

Loosen fuel line (Figure 1, Item 2) from fuel injector (Figure 1, Item 1).

6.

Place cleaning cloth around fuel line (Figure 1, Item 2) and fuel injector (Figure 1, Item 1).

WARNING

•

All personnel must stand clear during engine cranking operation. Failure to comply may

result in injury or death to personnel.

•

Fuel pressure is sufficient to penetrate skin. Wear hand protection and safety goggles at

all times when removing injector tubes. Failure to comply may result in injury or death to

personnel.

NOTE

Assistant will help with Step (7).

7.

Crank engine until all air is vented at fuel injector (Figure 1, Item 1).

8.

Tighten fuel line (Figure 1, Item 2) at fuel injector (Figure 1, Item 1).

9.

Repeat Steps (5) through (8) until all fuel injectors (Figure 1, Item 1) are purged free of air.

TM 9-2320-272-23-2

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