TM 9-2320-272-24-4
5-37. FUEL INJECTION PUMP CALIBRATION
THIS TASK COVERS:
h.
Manifold Pressure Compensator Test
a. Prestroke and Back Travel
i.
Fuel Delivery Test
b. Cylinder Phasing (Timing)
j.
Fuel Breakaway Test
c. Lock Timing
k.
Starting Fuel Delivery Test
d. High-speed Fuel Delivery Test
l.
Low Idle Fuel Delivery Test
e. Low-speed Fuel Delivery Test
m.
External Stop Setting
f. Bated Speed Test
g. Full Load Delivery
INITIAL SETUP:
MATERIALS/PARTS
APPLICABLE MODELS
Two copper washers (Appendix D, Item 44)
M939A2
Two break off screws (Appendix D, Item 19)
SPECIAL TOOLS
Two lockwashers (Appendix D, Item 397)
Copper washer (Appendix D, Item 42)
Plunger lift device (Appendix E, Item 98)
Two breakoff screws (Appendix D, Item 20)
Rack extension (Appendix E, Item 112)
Four lockwashers (Appendix D, Item 398)
TOOLS
Lubricating oil (Appendix C, Item 50)
General mechanic's tool kit (Appendix E, Item 1) Safety wire (Appendix C, Item 79)
Dial indicator (Appendix E, Item 36)
REFERENCES (TM)
TM 9-2320-272-24P
TM 9-4910-778-14&P
EQUIPMENT CONDITION
l Fuel injection pump repaired (para. 5-36).
l Fuel injection pump mounted to test stand
NOTE
Refer to TM 9-4910-778-14&P for operation of fuel injection pump
test stand, DFP 156.
1.
Mount dial indicator (2) and rack travel indicator holder (1) on drive end of fuel pump (5).
NOTE
Cylinder number one is located at drive end of fuel injection pump.
Install plunger lift device (8) on fuel pump (5) with finger of lifting device (8) resting on top of
2.
tappet located in cylinder number one.
Mount dial indicator (7) on lifting device (8) and zero dial indicator (7).
3.
Pull control lever (6) to full load position and using dial indicator shaft (3), push control rack (4) all
4.
the way back.
Preload dial indicator (2) giving control rack (4) 0.004 in. (0.1 mm) of preload travel.
5.
Manually rotate test stand driveshaft (9) until a reading is observed on dial indicator (7).
6.
Manually reverse rotation test stand driveshaft (9) until dial indicator (7) reads zero.
7.
Manually rotate test stand driveshaft (9) clockwise and take prestroke measurement from dial
8.
indicator (7). Correct prestroke measurement should be 0.120-0.128 in. (3.05-3.25 mm).
If correct prestroke measurement is not obtained, perform steps 10 through 13.
9.
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