TM 10-4320-307-24
4-11
INJECTOR REPAIR (CONT).
CLEANING/INSPECTION/REPAIR:
Dry cleaning solvent is potentially dangerous. Avoid repeated and
prolonged breathing of vapors and skin contact with the liquid. Do not
use near open flame, arcing equipment, or other ignition source. Always
wear eye protection and protective clothing.
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.
1.
Check and make note of injectors having carbon deposits at tip of plunger.
2.
Clean injector parts of any carbon varnish using dry cleaning solvent.
NOTE
Ultrasonic cleaning is recommended for barrel, plunger, and cup.
3.
Neutralize the solvent after cleaning by dipping the parts in mineral spirits and dry with compressed air.
CAUTION
Do not use drills or other instruments to clean injector cup holes. This
can alter the hole size. Wires may be used if wire is a smaller size than
spray hole. Never use a wire brush or crocus cloth to clean cup tip area.
4.
Clean injector cup holes using wire of smaller diameter than spray holes.
CAUTION
After cleaning injector parts, a
clean area, free of grease and dirt,
must be provided for inspection
procedures. Most injector failures
are caused by dirt.
5.
Place all injector parts on lint-free towels on work
bench area for inspection.
6.
Inspect plunger (1) as follows:
a.
Excessive wear or fretting may be found on
spring retainer contact area of plunger
flange. Replace plunger and barrel assem-
bly if plunger flange is less than 0.144 inch
(3.66 mm) thick.
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