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TM 5-4320-305-24
3-15.
TEST/REPLACE FUEL INJECTORS (Continued)
WARNING
Death or serious injury could occur if diesel fuel oil is not handled carefully. Use
in a well-ventilated area away from open flame, arcing equipment, ignition
sources, heaters, or excessive heat. Always store fuel in proper, marked
containers. DO NOT SMOKE.
2
Connect Bosch pump outfit No. 003-3345 (1).
3
Fill Bosch pump fuel container 3/4 full with diesel fuel
oil. Do not overfill.
4
Make sure pressure valve (2) is turned all the way
clockwise and closed. Pump up air pressure in unit by
pumping the pump hand lever (3) up and down
several times.
5
Slowly turn pressure valve (2) counterclockwise. As
the valve starts to open, read fuel injection pressure
on gage (4). Continue to open valve to increase fuel
injection pressure to injector (5) until fuel sprays out of
nozzle (6). Read and record injection pressure.
Injection pressure should be 2611 to 2727 psi
(18000 to 18 800 kPa) for a new injector, or 2538 to 2654 psi (17 500 to 18 300 kPa) for an injector in operation and
being tested. Injection pressure may be adjusted if it does not fall within the limits above. Refer injector to general
support for adjustment or repair, and replace injector.
6
Check fuel spray (7) pattern from injector nozzle (6). Fuel should spray out in several evenly spaced jets of equal
thickness and with no mist surrounding the jets. If spray pattern does not conform to above, refer injector (3) to
general support maintenance for repair, and replace injector. If injector nozzle drips fuel at approximately 2100 to
2360 psi (14 500 to 16 300 kPa) before it has reached recommended injection pressure, refer injector to general
support maintenance for repair, and replace injector. If nozzle drips fuel after injection pressure test, refer injector
to general support for repair, and replace injector.
3-69
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