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 282 of 836
TM 9-2320-272-24-4
5-37. FUEL INJECTION PUMP CALIBRATION (Contd)
i. Fuel Delivery Test
1.
2.
3.
4.
5.
6.
7.
8.
9.
Apply 13.1 psi (90.3 kPa) to manifold pressure compensator (2).
Adjust fuel pump (1) to 700 rpm.
Set test stand to measure fuel delivery at 1,000 strokes.
Set control lever (3) to full load position.
Check fuel delivery quantity. Correct fuel delivery quantity should be 8.73-9.21 in.
3
(143.0-151.0 cm
3
).
Check fuel spread. Fuel spread should be 0.427 in.
3
(7.0 cm
3
).
Decrease fuel pump speed (1) to 500 rpm.
Check fuel delivery quantity. Correct fuel delivery quantity is 5.61-5.74 in.
3
(92.0-94.0 cm
3
).
Adjust fuel delivery quantity by turning each barrel assembly (4) counterclockwise or clockwise
until correct fuel delivery quantity is obtained.
5-276
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