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 TM 55-1905-219-14-11
5-72. FUEL INJECTOR - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-INSPECTION (Cont)
Check for enlarged orifices in the
spray tip. Replace damaged or
excessively worn parts. Check the
minimum thickness of the lapped
parts as noted in the chart.
m. Examine the seating area of the
needle valve for wear or damage.
Also examine the needle quill and
its contact point with the valve
spring seat. Replace damaged or
excessively worn parts.
n. Examine the needle valve seat area
in the spray tip for foreign
material. The smallest particle of
such material can prevent the
needle valve from seating properly.
Polish the seat area with polishing
stick. Coat only the tapered end
of the stick with polishing compound
and insert it directly into the
center of the spray tip until it
bottoms. Rotate the stick 6 to 12
times, applying a light pressure
with the thumb and forefinger.
Be sure no compound is accidentally placed on the lapped
surfaces located higher up in the spray tip. The slight-
est lapping action on these surfaces can alter the near-
perfect fit between needle valve and tip.
o. Before reinstalling used injector
parts, lap all sealing surfaces.
indicated by the arrows in step k.
It is also good practice to lightly
lap the sealing surfaces of new
injector parts which may become
burred or nicked during handling.
5-1028
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