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 TM 55-1905-220-14-11
5-72.
FUEL INJECTOR - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-CLEANING (Cont)
Turn it in a clockwise direction to
remove the carbon deposits on the
flat spray tip seat as shown below.
Remove the carbon deposits from the
lower end of the injector nut with
carbon remover J9418-5, in the same
manner. Use care not to remove any
metal or to set up burrs on the
spray tip seat.
Wear protective eye goggles when using compressed air.
n. Wash the injector nut in clean fuel
oil and dry it with compressed air.
Carbon deposits on the spray tip
seating surfaces of the injector nut
will result in poor sealing and con-
sequent fuel leakage around the
spray tip.
o. When handling the injector plunger,
do not touch the finished plunger
surfaces with your fingers. Wash
the plunger and bushing with clean
fuel oil and dry them with compressed
air. Be sure the high pressure
bleed hole is not plugged. If this
hole is plugged, fuel leakage will
occur at the upper end of the
bushing where it will drain out of
the injector body vent and rack
holes, during engine operation,
causing a serious oil dilution
problem. Keep the plunger and
bushing together as they are mated
parts.
p. After washing, submerge the parts in
a clean receptacle containing clean
fuel oil. Keep the parts of each
injector assembly together.
5-1026
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