TM 5-3810-300-24&P-3
2.0 Trouble Shooting (Needle Valve Injectors)
SUGGESTED REMEDY
1.Clean the spray tip as outlined under Clean Injector
Parts.
5.Replace the needle valve and spray tip assembly.
6.Replace the spring seat.
2.Replace the needle valve and spray tip assembly.
7.Replace the valve spring.
8.Replace the cracked parts.
3.Clean the spray tip with tool J 1243.
9.Replace the plunger and bushing assembly.
10.Lap the sealing surfaces.
4.After the possibility of an incorrect or faulty spray tip
11.Disassemble the injector and clean all of the parts.
has been eliminated and the injector output still does not
12. Assemble the gear with the drill spot mark on the
fall within its specific limits, replace the plunger and
tooth engaged between the two marked teeth on the
bushing with a new assembly.
rack.
13.Replace the spray tip and the plunger and bushing
assembly to provide the correct output.
NOTE: The fuel output of an injector varies with
the use of different spray tips of the same size
due to manufacturing tolerances in drilling the
tips. If the fuel output does not fall within the
specified limits of the Fuel Output Check Chart,
try changing the spray tip. However, use only a
tip specified for the injector being tested.
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