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TM 5-4320-306-24
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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