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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