TM 5-3895-382-24
3.
Look for any leakage from the pressure faces of the
holder and the retaining nut of the fuel injector nozzle. If
leakage is visible, make sure that the components are
tightened to the correct torque.
If leakage continues to occur, unscrew the retaining nut
from the body. Inspect the threaded surfaces for foreign
particles and damage. If the faces are clean and
undamaged, test the fuel injector nozzle. Repeat Steps
1 and 2.
Fuel Injector Nozzle and Seat Test
1.
Connect the fuel injector nozzle (9) to the tooling. Refer
to Illustration 57 for more information.
Position the fuel injector nozzle so that the direction of
the fuel spray is into the 1U-8857 Extension (11) and
the 8S-2270 Fuel Collector (12).
2.
Pump the pressure of the nozzle tester to approximately
1030 kPa (150 psi) below the opening pressure of the
fuel injector nozzle. Fuel should not collect on the tip of
the fuel injector nozzle in a sufficient quantity in order to
drip from the tip for at least ten seconds. A light
dampness is acceptable.
If the results of the tests are not acceptable, replace the
fuel injector nozzle.
Test The Spray Pattern
Make sure that you wear eye protection at all times during
testing. When fuel injection nozzles are tested, test fluids
travel through the orifices of the nozzle tip with high
pressure. Under this amount of pressure, the test fluid
can pierce the skin and cause serious injury to the
operator. Always keep the tip of the fuel injection nozzle
pointed away from the operator and into the fuel collector
and extension.
The pressure adjustment must be correct before testing the
spray pattern.
Illustration 58
Correct spray pattern for fuel injector nozzles.
1.
Connect the fuel injector nozzle (9) to the tooling. Refer
to Illustration 57 for more information.
Position the fuel injector nozzle so that direction of the
fuel spray is into the 1U-8857 Extension (11) and
8S-2270 Fuel Collector (12).
2.
Close the gauge protector valve and the shutoff valve.
Open the pump isolator valve.
3.
Quickly pump the nozzle tester and look at the spray
pattern when the fluid begins to flow through the orifices
of the fuel injector nozzle.
The spray, which flows from all of the orifices, must
have the same pattern. The fuel injector nozzle is
defective if there is a difference in the vertical patterns
or a difference in the horizontal patterns. Refer to the
correct spray pattern in Illustration 58.
NOTE: Be sure that the gauge protector valve is closed
before the fuel injector nozzle is removed from the
nozzle tester. Closing the valve will prevent
damage to the pressure gauge.
Installation Of Fuel Injector Nozzles
1.
When a fuel injector nozzle is removed from the cylinder
head, replace the seat washer (5). Refer to Illustration
55 for more information.
NOTE: If a seat washer remains in the recess of the
cylinder head for the fuel injector nozzle, the
protrusion of the fuel injector nozzle into the
cylinder will be incorrect. Also, if the seat washer
is damaged, the protrusion of the fuel injector
nozzle into the cylinder will be incorrect.
2.
Place a 2 mm (0.1 inch) bead of 4C-5591 Anti-Seize
Compound on the first two threads of the fuel injector
nozzle below the nut (3). Refer to Illustration 55 for
more information.
6-68
