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TM 10-4320-324-14
5-15. Injection Nozzle Repair/Replacement (CONT).
b. Testing.
WARNING
Keep hands away from spray. Spray is under high pressure
and can cut through skin.
(1)
Connect injector (1) to tester (2).
(2)
With pressure gauge cut in, press tester pump lever several times.
(3)
Read opening pressure and inspect spray pattern.
NOTE
Readings should be 2537-2653 psi (175-183 bar) for used nozzle. Readings should be 2610-2726 psi
(180-188 bar) for new nozzle, or new spring in nozzle. The jet pattern must be solid without surrounding
mist.
(4)
Reduce pressure to 362.5-435 pounds (25-30 bar) below specified opening pressure, check that no fuel dribbles
from nozzle.
(6)
Adjust nozzle opening pressure by adding or removing shims (7), as directed in paragraph e.
c. Disassembly.
(1)
Using a suitable clamping device, remove union nut (1), nozzle (2), needle (3), and intermediate piece (4).
(2)
Remove plunger (5), spring (6), and shims (7), from holder (8).
5-40
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