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TM 10-3930-638-24&P
4-3. FUEL SYSTEM MAINTENANCE (cont)
a. Fuel Injector (cont).
Spray pattern check
STEP
LOCATION
ITEM
ACTION
REMARKS
TESTING (cont)
4
b. Valve is not free free guide, lap valve to
(cont)
tip seat (see reconditioning)
c. Inspect for pitted or cracked valve
tip, eroded valve seat or pitted and
distorted body These conditions
require replacement of complete
fuel rejector
5
a. Close pressure
gage
b. Operate
Fuel shall be finely atomized and not a
tester
solid irregular spray pattern
at 60 strokes
per minute
and observe
spray pattern
Injector will chatter when tester is operated
rapidly Chatter is an indication of valve
freedom and will improve atomization
Chatter also indicates good seat width and
interference angle conditions
If fuel injector produces a solid irregular
spray pattern
a. Check for clogged, eroded, or
chipped orifices
b. Disassemble and clean fuel rejector
(see disassembly)
c. Lap valve to guide area (see recondi-
tioning)
4-79
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