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FUEL INJECTOR TEST/REPLACEMENT - continued
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TM-10-3930-673-34 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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Installation. - TM-10-3930-673-340262
TM 10-3930-673-34
(a)
Connect injector (1) to fuel injector
1
test set.
FUEL INJECTOR
(b)
Open valve and operate pump lever
TEST SET
at a rate of one stroke per second
while observing test pressure gauge.
VALVE
(c)
Spray must begin at a pressure of
3553 73 psi (24497.94
503.34 kPa).
(d)
Check for well atomized spray
pattern.
TR00785
(2)
Leakage test.
(a)
Use same test setup as for opening pressure test (Step (1) above).
(b)
Open valve on test set.
(c)
Operate pump lever as necessary to hold pressure at a level about 290 psi (1999.55 kPa) below
opening pressure noted in Step (1)(c) above.
(d)
No drops must fall from nozzle tip for a period of 10 seconds, while maintaining pressure
specified in Step (c), above. If drops do appear within 10 seconds, replace injector.
(3)
Chatter test.
(a)
Use same test setup as for opening pressure test (Step (1) above).
NOTE
Do not evaluate used nozzles at lower pumping rates. A used nozzle is serviceable if it
passes the leakage test, chatters audibly at higher pumping rates and uniformly
atomizes fuel.
(b)
Operate pump lever at a rate that causes nozzle to chatter softly while discharging fuel in a
broad and finely atomized pattern. If conditions of prior note are not met, replace nozzle.
4-9

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