TM-9-2320-272-24-4

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4

JUNE 1998

TM-9-2320-272-24-4 - Page 217 of 836

TM 9-2320-272-24-4

5-31. MOUNTING FUEL INJECTION PUMP TO TEST STAND (Contd)

8.

Install rear support bracket (19) and clamp bar (24) on test stand (20) with two washers (16) and

screws (15).

9.

Connect six test stand fuel lines (30) to delivery valve holders (29) and test stand injectors.

10.

Connect air line (32) to manifold pressure compensator (31).

11.

Remove plug (36), two copper washers (35), and adapter (37) from fuel pump (14). Discard copper

washers (35).

12.

Install outlet elbow (34) on fuel pump (14).

13.

Connect test stand supply line (33) to outlet elbow (34).

14.

Remove plug (38) and copper washer (39) from side of fuel pump (14) for access to number one

cylinder. Discard copper washer (39).

15.

Refer to table 5-10, Test Stand Requirements, for further preliminary requirements.

Table 5-10. Test Stand Requirements.

ITEM

REQUIREMENTS

Calibration Fluid Temperature

100°-108°F (38°-42°C)

Inlet Pressure

22 psi (152 kPa)

Opening Pressure

3,000-3,046 psi (20,684-21,001 kPa)

Firing Order

1-5-3-6-2-4

Select Drive Rotation

1:2

Direction of Drive Rotation

Clockwise

Number of Injection Cylinders

Six

5-211