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TM 10-3930-638-24&P
4-3. FUEL SYSTEM MAINTENANCE (cont)
a. Fuel Injector (cont).
Injector leak-off
check
STEP
LOCATION
ITEM
ACTION
REMARKS
TESTING (cont)
d. Check for pitted or eroded valve or
(cont)
seat, valve interference angle worn,
bent valve and distorted body. These
conditions require replacement of
complete fuel injector
6
a. Loosen connector
nuts and reposition
injector tip slightly
above horizontal
plane
b. Tighten con-
nector nuts
and raise
pressure to
1500 PSI
c. Observe
After one drop falls, leak-off must be 3 to
leakage
10 drops in 30 seconds with No. 2 diesel
from
fuel at room temperature (65 to 75
return
degrees)
end of
fuel injector
If proper leak-off is not obtained:
a. If leak-off is excessive, replace fuel
injector
b. If leak-off is low, disassemble and
clean fuel injector (see disassembly)
c. Lap valve to guide area to increase
leak-off (see reconditioning)
DISASSEMBLY
NOTE
Fuel injector contains precision ground and lap fitted parts;
exercise care in keeping your work area and tools clean. Handle
parts carefully to avoid damaging them.
7
Carbon dam
Remove
Use long nose pliers
seal (1)
4-80
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