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 TM 10-3930-638-24&P
4-3. FUEL SYSTEM MAINTENANCE (cont)
a. Fuel Injector (cont).
REMARKS
ACTION
ITEM
LOCATION
STEP
CLEANING AND INSPECTION (cont)
22
Adjusting screw
Inspect
Replace if worn, or if threads damaged
(4, 9)
23
Spring (5)
Inspect
Check that free length of spring is 0.563
inch and compressed length is 0.456 to
0.478 inch at 29 pounds
RECONDITIONING/OVERHAUL
24
CAUTION
Excessive lapping will destroy interference angle between seat and
valve causing loss of chatter with poor atomization resulting in
replacement of fuel injector.
Injector body
Lap valve and
Use lapping compound FSCM 05083 P/N
tip seat
(11) tip seat
66-0145. Place small amount of lapping
compound on valve seat and insert valve
in injector body. Grip top of valve with
valve retractor P/N 66-0148 and rotate
valve by hand, first clockwise then coun-
terclockwise for a total of 3 to 5 revolu-
tions. Flush injector body thoroughly;
wash valve and reassemble injector and re-
test. If valve and seat are worn, seat may
be tight, but chatter may have been lost in
the lapping process. In such an instance
replace fuel injector
25
Injector body
Lap valve
Use lapping compound FSCM 05083 P/N
(11) valve guide
guide
66-0145. Place small amount on guide area
of valve. Bottom valve in body and grasp
with valve retractor P/N 66-0148. Rotate
valve 10 revolutions while raising and low-
ering it very slightly. Flush and wash com-
pound from both parts, assemble fuel in-
jector and recheck fuel leak-off. If leak-off
is still low, lap guide until correct leak-off
is obtained. Flush fuel injector thoroughly
after lapping
4-84
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