Care must be exercised when
inserting the carbon remover J 9464-
01 in the spray tip to avoid
contacting the needle valve seat in
Wash the tip in fuel oil and dry it with compressed air.
Clean the spray tip orifices with pin vise J 4298-1 and
the proper size spray tip cleaning wire. Use wire J
21460 to clean .0055 " diameter holes and wire J 21461
Before using the wire, hone the end until it is smooth
and free of burrs and taper the end a distance of 1/16 "
Fig. 33. Lapping Spray Tip on Lapping Blocks J
with stone J 8170. Allow the wire to extend 1/8 " from
tool J 4298-1.
J 9418-5 (Fig. 30). Use care to minimize removing metal
The exterior surface of an injector spray tip may be
or setting up burrs on the spray tip seat. Remove only
cleaned by using a brass wire buffing wheel, tool J 7944.
enough metal to produce a clean uniform seat to prevent
To obtain a good polishing effect and longer brush life,
leakage between the tip and the nut. Carefully insert
the buffing wheel should be installed on a motor that
carbon remover J 9418-1 in the injector nut. Turn it
turns the wheel at approximately 3000 rpm.
clockwise to remove the carbon deposits on the flat spray
convenient method of holding the spray tip while
cleaning and polishing is to place the tip over the drill
end of the spray tip cleaner tool J 1243 and hold the
Wash the injector nut in clean fuel oil and dry it with
body of the tip against the buffing wheel. In this way,
compressed air. Carbon deposits on the spray tip seating
the spray tip is rotated while being buffed.
surfaces of the injector nut will result in poor sealing and
consequent fuel leakage around the spray tip.
Do not buff excessively. Do not use
a steel wire buffing wheel or the
When handling the injector plunger, do not touch the
spray tip holes may be distorted.
finished plunger surfaces with your fingers. Wash the
When the body of the spray tip is clean, lightly buff the
plunger and bushing with clean fuel oil and dry them with
tip end in the same manner. This cleans the spray tip
compressed air. Be sure the high pressure bleed hole in
orifice area and will not plug the orifices.
the side of the bushing is not plugged. If this hole is
plugged, fuel leakage will occur at the upper end of the
Wash the spray tip in clean fuel oil and dry it with
bushing where it will drain out of the injector body vent
and rack holes, during engine
Clean and brush all of the passages in the injector body,
using fuel hole cleaning brush J 8152 and rack hole
cleaning brush J 8150. Blow out the passages and dry
them with compressed air.
Carefully insert reamer J 21089 in the injector body (Fig.
29). Turn it in a clockwise direction a few turns, then
remove the reamer and check the face of the ring for
reamer contact over the entire face of the ring. If
necessary, repeat the reaming procedure until the
reamer does make contact with the entire face of the
ring. Clean up the opposite side of the ring in the same
Carefully insert a .375" diameter straight fluted reamer
Fig. 34. Location of Filter in Injector Body
inside the ring bore in the injector body. Turn the
reamer in a clockwise direction and remove any burrs
inside the ring bore. Then wash the injector body in
clean fuel oil and dry it with compressed air.
Remove the carbon deposits from the lower inside
diameter taper of the injector nut with carbon remover