TESTING AND ADJUSTMENT
b. Hold the lift adjustment screw (10) with a 5/64" hex
fuel injection nozzle opens. It is possible for the
wrench (13) and remove the locknut (9).
reading of the pressure on the gauge to go down
fast if the valve makes a noise (chatters) when it
opens. It is also possible for the reading of the
pressure on the gauge to be almost constant when
the valve in the fuel injection nozzle opens. The
pressure needed to open the valve must be the
same as shown in the chart. If the opening
pressure is less than 2200 psi (154.7 kg/cm2 ),
do not use the fuel injection nozzle again.
NOTE: The valve in the fuel injection nozzle can be good
and still not make a noise (chatter), or not have a very fine
vapor (spray) from the orifices in the tip of the fuel injection
nozzle during Step 2.
9. Locknut (for lift adjustment screw). 13. 5/64"
2400 to 2900 psi
2750 to 2900 psi
(168.7 to 203.9 kg/cm )
(193.3 to 203.9 kg/crn
c. Loosen the locknut (6) that holds the pressure
NOTE: The correct setting of the opening pressure for used
adjustment screw (7).
nozzles that have been cleaned is 2700 to 2900 psi (189.8
to 203.9 kg/cm2).
3. To make an adjustment to the opening pressure, use
the following procedure:
a. Remove the fuel injection nozzle (5) from the
8S2267 Nozzle Tester and put it in the 8S2250
Nozzle Holding Tool (11). Loosen locknut (9)
holding the lift adjustment screw. Turn the lift
adjustment screw (10) counterclockwise one turn.
5. Fuel injection nozzle. 14. 8H8505
d. Put the fuel injection nozzle (5) on the 8S2267
Nozzle Tester (2). Turn the pressure adjustment screw (7)
clockwise using a spanner-type screwdriver (15). Each
one-fourth of a turn will increase the opening pressure
9. Fuel injection nozzle. 11. 8S2250 Nozzle
approximately 250 psi (17.8 kg/cm ). Do not turn more
Holding Tool. 12. 8H8502 Combination Wrench.
than one-half of a turn to increase the opening pressure.
CAUTION: If the lift adjustment screw is not turned
counterclockwise one turn, the valve can be bent or the
e. Hold the pressure adjustment screw (7) and tighten
seat for the valve can be damaged when the pressure
locknut (6) just enough so that the pressure adjustment
adjustment screw is turned.
screw (7) will not turn.