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 221 of 836

TM 9-2320-272-24-4

5-32. FUEL INJECTION PUMP PRETEST (Contd)

NOTE

Ensure a steady stream of calibration fluid flows from all bleed-off

valves. If not, increase calibration fluid pressure until a steady

stream of calibration fluid is obtained.

11.

Manually rotate test stand driveshaft (8) in correct fuel pump rotation until calibration fluid stops

flowing from bleed-off valve (1).

12.

Check prestroke measurement. Measurement should be 0.360-0.480 in. (9.14-12.19 mm).

13.

Remove plunger lift device (5) and dial indicator (4) from fuel pump (13).

14.

Install copper washer (7) and plug (6) on fuel pump (13).

5-215