TM 9-4110-255-14
5-42. NOZZLE TESTING AND REPLACEMENT .-Continued
WARNING
Before applying pressure to the nozzle tester, be sure that all connections are tight, and that
the fittings are not damaged. Fluid escaping from a very small hole can be almost invisible.
Use a piece of cardboard or wood, rather than hands, to search for suspected leaks.
Fuel from the spray orifices can penetrate clothing and skin causing serious personal injury.
The nozzle tip should always be directed away from the operator. Enclosing the nozzle in a
transparent cover is recommended. Place a clear, protective shield around spray zone to
avoid possible personal injury from spray.
If injured by escaping fluid, see a doctor at once. Serious infection or reaction can develop if
proper medical treatment is not administered immediately.
(2) Operate the injector test bench lever rapidly. The nozzle assembly (3) should chatter audibly and spray
evenly.
(3) With pressure gage reading injector test bench pressure, press the lever slowly and steadily until fuel is
sprayed from nozzle assembly (3). The pressure registered on the gauge should be 3,071 to 3,471 psi
(21,190 to 23,950 kPa). If pressure is not met, replace nozzle.
(4) Slowly press injector test bench hand lever until the pressure gauge reads 2986 psi (20,603 kPa). Hold at
this pressure for 10 seconds. No diesel fuel should accumulate at the nozzle tip. If fuel is detected,
replace nozzle.
(5) If no failure was indicated, install nozzle assembly (3).
Figure 5-38. Nozzle
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