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TM 10-3930-638-24&P
4-3. FUEL SYSTEM MAINTENANCE (cont)
a. Fuel Injector (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENTS
35
Opening
a. Loosen
pressure
pressure
adjustment
adjusting
screw
locknut (3)
b. Loosen
Hold pressure adjusting screw locknut (3)
lift adjus-
while loosening
ting screw
locknut (8)
c. Install fuel
injector
with tip
downward
in test stand
d. Back out lift
adjusting
screw (9)
one full
turn
e. Pump fuel
Opening pressure shall be 3150 to 3250 PSI
through
for new fuel injectors or 2950 to 3050 PSI
fuel injector
for used fuel injectors
and note
opening
pressure
f. Turn pressure
Turn clockwise to increase opening pressure
adjusting
or counterclockwise to decrease opening
screw (4)
pressure (gage reading will drop sharply at
while
point that fuel injector valve opens)
holding
lift adjusting
screw (9)
until correct
opening
pressure is
obtained.
Don’t tighten
pressure
adjusting screw
locknut (3) at
this time
g. Perform valve
lift adjustment
4-86
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