FUEL INJECTOR ASSEMBLY REPLACEMENT - CONTINUED
TESTING - CONTINUED
WARN I N G
Ensure eye protection is worn at all times during testing. When fuel injector nozzles are tested, test
fluid travels through orifices of nozzle tips at high pressure. Under this amount of pressure, test fluid
can pierce skin and cause injury to personnel. Always keep tip of fuel injector nozzle pointed away
from personnel and into fuel collector and extension. Failure to follow this warning may result in
injury to personnel.
N OT E
Bench test fuel injector nozzles at temperature range of 64 to 70°F (18 to 21°C).
Connect fuel injector nozzle (2) to tooling as shown.
Spray from fuel injector nozzle must be directed into coupling and can.
Opening pressure for injectors is 3,675 ± 50 psi (25,338 ± 345 kPa).
If opening pressure is not within range, fuel injector nozzle must be replaced.
Use clean calibration fluid when fuel injector nozzles are tested.
Close gage protector valve. Close shutoff valve. Open pump isolator valve. In order to flush fuel injection nozzle, oper-
ate nozzle tester for 10 to 15 strokes at a rate of approximately 60 strokes per minute.
Open gage protector valve. Slowly increase pressure until valve in fuel injector nozzle (2) opens. Note highest pressure
indication on dial indicator before pointer moves to 0 psi (0 kPa). This highest pressure indication is opening pressure of
fuel injector nozzle.
N OT E
Opening pressure is defined when valve
needle is lifted from valve seat.
If opening pressure is not within range of 3,675 ± 50
psi (25,338 ± 345 kPa), fuel injector nozzle (2) must