TM 5-4320-302-14
5-16.
FUEL INJECTORS (CONT)
Location/Item
Action
Remarks
6.
Bosch pump
Make sure pressure valve is turned all the way clock-
outfit No.
wise and closed. Pump up air pressure in unit by
003-3345
pumping the pump hand lever up and down several
times.
7.
Pump outfit,
Slowly turn pressure valve counterclockwise. As the
pressure valve,
valve starts to open, read fuel injection pressure on
injector, and
gage. Continue to open valve to increase fuel injection
nozzle
pressure to injector until fuel sprays out of nozzle.
Read and record injection pressure. Injection pressure
should be 2611 to 2727 psi (18 000 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.
8.
Injector and
Check fuel spray pattern from injector nozzle. Fuel
nozzle
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 to general support 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
for repair, and replace injector. If nozzle drips
fuel after injection pressure test, refer injector to
general support for repair, and replace injector.
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