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TM 5-4320-306-24
4-5. REPAIR/TEST FUEL INJECTORS (Continued)
CLEANING:
WARNING
Death or serious injury could occur if diesel fuel oil is not handled carefully. Use in a well-
ventilated area away from open flame, arcing equipment, ignition sources, heaters, or excessive
heat. Always store fuel in proper, marked containers. DO NOT SMOKE.
Death or serious injury could occur if compressed air is directed against the skin. Do not use
compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11
kgcm2) or less. When working with compressed air always use chip guards, eye protection, and
other personal protective equipment.
Wash all components in clean diesel fuel oil and blow out with compressed air
INSPECTION/REPAIR
CAUTION
The nozzle needle and nozzle body are lapped together and should not be mixed up or replaced
separately. Do not touch the nozzle needle seating surface.
1
Holding the nozzle vertically, the nozzle needle must be allowed to slide slowly and smoothly on its seating under
its own weight If nozzle needle does not slide smoothly, wash with fuel again and replace if necessary
2
Check seating surfaces and centering pins on intermediate piece for wear and be sure that pins seat properly.
ASSEMBLY:
1
Insert existing shims (7) into nozzle holder (2)
NOTE
Spraying pressure is increased by adding shims and reduced by removing them
2
Insert pressure spring (6) in nozzle holder (2).
3
Insert plunger (5) with spigot facing pressure spring (6)
4
Insert intermediate piece (4) guide pins into holes in nozzle holder (2)
5
Aline nozzle on intermediate piece (4) and tighten nozzle cap (1) to nozzle holder (2)
4-38
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