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TM 5-4320-305-24
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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