ADJUSTMENTS (cont) - TM-10-3930-638-24-P0865

TM 10-3930-638-24&P

4-3. FUEL SYSTEM MAINTENANCE (cont)

a. Fuel Injector (cont).

ITEM

REMARKS

STEP

LOCATION

ACTION

ADJUSTMENTS (cont)

CAUTION

In following step, don't manually bottom valve using excessive

force as bending of valve can result requiring fuel injector replace-

ment.

a. Pump fuel

Valve lift

through

adjustment

fuel injector,

hold pressure

adjusting

screw and

slowly turn

lift adjusting

screw clock-

wise until

valve ceases

to open

Opening pressure for new fuel injectors is

b. Raise pressure

200 to 500

3150 to 3250 PSI; for used fuel injectors

PSI over

2950 to 3050 PSI. Some fuel may collect

fuel injector

on injector tip; however a rapid dribble

opening

must not be apparent

pressure

Turning screw (9) 1/2 turn sets valve lift

c. To set lift,

turn lift

0.009 inch off valve seat

adjusting

screw (9)

counter-

clockwise

1/2 turn

Use tool P/N AN9508-6; tighten to 40-45

d. Hold lift

pounds-inch torque

adjusting

screw and

tighten lift

adjusting

screw locknut

e. Recheck open-

ing pressure

adjustment

and readjust

if necessary

f. Test fuel

injector

g. Remove fuel

injector from

test stand

4-87