TESTING AND ADJUSTMENT
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.
LOOSENING PRESSURE SCREW
8. Pressure screw.
c. Tilt the fuel injection nozzle down, a small amount,
2400 to 2900 psi
2750 to 2900 psi
(168.7 to 203.9 kg/cm2)
(193.3 to 203.9 kg/crn2)
from the vertical position and remove pressure screw
(8) and shims (9).
NOTE: If shims (9) do not come out of the fuel injection
NOTE: The correct setting of the opening pressure for used
nozzle, turn the fuel injection nozzle over and let the
nozzles that have been cleaned is 2700 to 2900 psi (189.8
shims, spring, and spring seat fall into your hand. The
to 203.9 kg/cm2 ).
valve can come out of the body by its own weight and must
be held carefully by the stem.
3. To make an adjustment to the opening pressure, use
the following procedure:
d. To make an increase in the opening pressure add a
4N5730 Shim. The 4N5730 Shim is .005 in. (0.13
a. Remove the fuel injection nozzle (4) from the
mm) thick and will increase the opening pressure
8S2267 Nozzle Tester and put it in the 8S2250
approximately 250 psi (17.8 kg/cm ) maximum of
Nozzle Holding Tool (7). Loosen Locknut (5). Turn
two shims can be added to make an increase in the
lift adjustment screw (6) counterclockwise two or
PRESSURE SCREW AND SHIMS
8. Pressure screw. 9. Shims.
4. Fuel injection nozzle. 5. Locknut. 6. Lift
adjustment screw. 7. 8S2250 Nozzle Holding
CAUTION: If the lift adjustment screw (6) is not loosened,
e. Assemble the fuel injection nozzle being sure the
the valve can be bent or the seat for the valve can be
thicker shim is against the pressure screw as shown.
damaged when the fuel injection nozzle is assembled in
Put the fuel injection nozzle in the 8S2250 Nozzle
Holding Tool. Put the nozzle holding tool in a vise
and tighten the pressure screw (8) to 75 to 80 lb. in.
b. Loosen the pressure screw (8). Remove the fuel
(86.5 to 92.2 cm. kg).
injection nozzle from the 8S2250 Nozzle Holding