TM 5-1940-277-34
INJECTOR TEST AND REPAIR INSTRUCTIONS
(Continued)
LOCATION
ITEM
ACTION
REMARKS
• Check time it
takes to fall
to 1,455 psig
(99 atm). The
time should be
Less time indi-
10 seconds for
cates damaged or
new injectors,
dirty injector.
6 seconds for
Disassemble, in-
reconditioned.
spect and repair.
e.
Needle valve
Seat Leakage Test:
(10)
• Wipe injector
tip dry.
• Pump tester to
2,962 psig
(201.6 atm).
• Hold pressure
Nozzle tip damp-
10 seconds.
ness is permissi-
ble but drop must
not be visible.
• Repair if test
failed.
f.
Injector
Atomization Test:
• Close valve on
tester.
• Pump tester
Maintain
until pressure
pressure.
between 2,962
and 3,036 psig
(202 and 207 atm)
is reached.
• Examine four
Each spray should
sprays.
have no visible
streaks or dis-
tortion. Spray
should spread
about 2 inches
before hitting
sides of contain-
ers. Injector
should break with
hard note (pop).
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