TM 5-3895-382-24
Test The Spray Pattern
Make sure that you wear eye protection at all times during
testing. When fuel injection nozzles am 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 53
Correct spray pattern for a fuel injector nozzle.
1.
Refer to Illustration 52 in order to connect the fuel
injector nozzle (2) to the tooling.
Position the fuel injector nozzle so that the fuel spray is
directed into the 1U-8857 Extension (4) and the
8S-2270 Fuel Collector (6).
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
(18) 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 53.
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 A Fuel Injector Nozzle
Illustration 54
Components for installation of a fuel injector nozzle.
(20) Camp
(21) Spacer
{22) Dust seal
(23) Body
(24) Seat washer
1.
When a fuel injector nozzle is removed from the cylinder
head, replace the seat washer (24) and the dust seal
(22).
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.
The dust seal (22) is positioned under the spacer (21)
and the clamp (20). The dust seal is positioned on the
face of the cylinder head.
Fuel Injector Nozzle Tests On Type 2
Engines and 7BJ Engines
NOTE:
For a complete description of Type 1 and Type 2
engines, refer to the Systems Operation, Testing
and Adjusting Module, "Engine Design" for more
information.
Perform the following procedures in order to determine if a fuel
injector nozzle does not work correctly.
6-65
