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![]() b. Cleaning.
(2) Valve stop spacers. Inspect the lapped
Note. D O not remove carbon from the valve,
sealing surfaces on the ends of the valve stop
(K-2, figure 4-170), or inner surface of nozzle
s p a c e r (L) for scratches, discoloration, and
body (K-1 )with a sharp tool, abrasive material, or
cracks. Inspect the area around the center hole
s t e e l wire brush, a s these implements and
o n the nozzle end for evidence of wear and
materials will severely damage the highly
pounding by the nozzle valve. Maximum
polished surfaces.
allowable depth of wear or pounding at this area
is 0.003-inch. Inspect drilled passages in spacer
(1) Fuel injector nozzle assembly. S o a k
n o z z l e body in carbon removing solvent to
for obstructions.
remove major carbon d e p o s i t s . Remaining
(3) Adjusting spring and spring seats.
carbon deposits should be removed using a soft
I n s p e c t the nozzle opening pressure adjusting
cloth or felt pad and mutton tallow. A piece of
spring (N) and spring upper and lower seats (D
soft wood, soaked in oil may also be used as a
and M) for cracks and evidence of wear.
carbon remover.
(4) Holder spring. Inspect holder spring (P)
(2) Nozzle body spray orifices. C l e a n
for cracks, and for evidence of discoloration due
carbon from the orifices of the nozzle body by
to excessive heat. Inspect free length of holder
s o a k i n g nozzle body in a carbon removing
spring. Limit should be from 1.403 to 1.409-inch
solvent only. Do not attempt to clean orifices
w h e n the new copper gasket, FSN 5310-861-
with cleaning wire as this method will distort
1406, is used. If the old copper-asbestos gasket is
nozzle orifices and also may block opening due to
used the limit should be 1.407 to 1.409-inch.
wire breakage. It is difficult and often impossible
(5) Holder body. Inspect the holder body
to remove broken pieces of wire.
(A) for cracks, burs, nicks, and raised metal.
(3) Fuel injector h o l d e r and associated
Inspect lapped sealing surface for scratches and
parts. Clean all parts thoroughly. Be sure hands
d i s c o l o r a t i o n . Inspect the threaded area and
are kept free from accumulation of grease which
t a p p e d openings f o r s t r i p p e d o r d a m a g e d
will cause collection of dust and grit on parts.
threads.
Cover or wrap all parts after cleaning to protect
(6) Nozzle cap nut. Inspect the nozzle cap
them from dirt accumulation.
nut (J) for nicks, burs, raised metal surfaces, and
c. Inspection.
for cracks due to overheating. Inspect threaded
area inside nut for stripped or damaged threads.
(1) Nozzle body and valve. Inspect seat of
nozzle valve (K-2. fig. 4-170) for evidence of
Inspect the gasket area on end of nut for deep
wear, distortion of the valve seat due to pound-
scratches.
ing, d i s c o l o r a t i o n due to overheating, and
( 7 ) Nozzle retainer. Inspect the nozzle
retainer (F) for cracks, nicks, burs, and raised
pitting. Inspect the valve stem between seal and
shoulder for scratches and discoloration. Check
metal, and for rounding of the hexagon nut area.
fit of valve in nozzle body by lifting the valve
Inspect threaded area for stripped or damaged
about one-third of its length out of the body. The
threads,
valve should slide back to its seat without aid
(8) Fuel injector tube connector. Inspect the
when the assembly is held at a 45 degree angle.
fuel injector tube connector(Q) for cracks and for
Mark sticking assemblies for repair. Inspect the
s t r i p p e d or damaged threads.
eight spray orifices in the nozzle body tip and the
d. Repair.
drilled passage in the body for freedom of ob-
(1) Nozzle body and valve.
structions, I n s p e c t lapped sealing surface of
(a) Replace nozzle body (K-1, figure 4-
v a l v e body for scratches, discoloration, and
170) and nozzle valve (K-2) when body seat or
cracks. Inspect nozzle body valve seat, using a
valve seat is badly worn, pounded, or pitted, or
strong light and a magnifying glass (5 to 7 power
when nozzle does not conform to spray pattern
magnification
minimum)
for
scratches,
l i m i t s specified in paragraph 4-17c(3). Minor
d i s c o l o r a t i o n , wear, pitting, and evidence of
discoloration or imperfections of body and valve
pounding.
seat can be cleaned up by lapping the valve into
Note. An otoscope, such as used by
the body. Clamp valve by its stem in jaws of
physicians for examination of the inner ear, is
rotating chuck. Place a very minute quantity of
well suited for this purpose.
fine lapping compound on tip of valve. Slide
4-86
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