TM 5-3895-346-14
ENGINE OVERHAUL
FUEL INJECTOR
Figure 17. Injector Needle Valve Tester J 23010 with Auxiliary Tester J 22640
a. Actuate the pump lever several times and hold the pressure at 1500 psi (10 335 kPa) for 15 seconds.
b. Inspect the spray tip for leakage. There should be no fuel droplets although a slight wetting at the spray tip
is permissible.
Perform the needle valve lift test.
Fuel Output Test
Perform the injector fuel output test in calibrator J 22410. When injectors are removed from an engine for fuel
output testing and, if satisfactory, reinstalled without disassembly, extreme care should be taken to avoid
reversing the fuel flow. When the fuel flow is reversed, dirt trapped by the filter is back-flushed into the injector
components.
Before removing an injector from the engine, note the direction of the fuel flow. To avoid reversing the fuel
flow when checking injector fuel output, use the appropriate adaptor. The position of the braided fuel inlet tube
and the
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