3-55. FUEL INJECTOR TESTING; TEST NO. 3 (Contd)
d. Adjusting and Measuring Fuel Delivery (Contd)
The following instructions are for ST-790 test stand only. Refer to operating instructions for
any other test stand.
When seating burnishing tool, use care not to push small knob in too hard or overtighten
indicator knob. Stop when slight contact is made. Damage can be caused to injector
assembly. Test stand must be running while burnishing.
Burnishing tool (51)
Burnish as follows:
a. Turn indicating knob (52) until
there is a space 0.375 in. (9.525 mm)
from large knob (48).
b. Slowly push small knob (49) in
until slight contact is made on
injector assembly (39).
c. Turn small knob (49)
counterclockwise to lock with
large knob (48) and indicating
d. Slowly turn indicating knob (52)
Do not overtighten.
in until slightly seated in injector
e. Index indicator knob (52) with
mark on large knob (48).
f. Advance indicator knob (52)
Check fuel delivery. After each
one mark and back off until
four cycles, reclamp injector
spaced 0.375 in. (9.525 mm).
assembly to ensure accuracy.