TM 5-3825-229-14&P
6-14. FUEL INJECTORS (cont)
b.
Testing (cont).
(2)
Connect the fuel injector to the upper fitting on the nozzle tester.
(3)
Fill tester supply tank with correct diesel fuel.
WARNING
When testing or adjusting fuel injectors, do not place your hands or arms in front of injector nozzle. Nozzle discharge
pressure can cause oil to penetrate the skin an cause blood poisoning or serious skin infection.
(4)
Check nozzle opening pressure as follows:
(a) Suspend injector nozzle in a glass jar to contain oil spray and allow for observation of
injector operation.
(b) Close the pressure gauge valve. Flush injector by operating hand [ever rapidly five to
ten strokes.
(c) Open the pressure gauge valve. Pump hand lever slowly to raise pressure until the injector valve
opens and spray ejects from nozzle.
(d) When injector valve opens the pressure will fall rapidly. Check pressure reading at which injector valve
opens.
(e) The nozzle should open at 1890 to 2000 psi (13,000-13,000 kPa).
(f)
If opening pressure does not meet specifications, clean, inspect and repair injector.
(5)
Check nozzle spray pattern as follows:
(a) With pressure gauge valve open, raise pressure as in (4) above.
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