TROUBLE SHOOTING CHARTS (Needle Valve Injectors)
SUGGESTED REMEDY
5. Replace the needle valve and spray tip assembly.
1. Clean the spray tip as outlined under Clean Injector
Parts.
6. Replace the spring seat.
2. Replace the needle valve and spray tip assembly.
7. Replace the valve spring.
3. Clean the spray tip with tool J 1243.
8. Replace the cracked parts.
4. After the possibility of an incorrect or faulty spray
9. Replace the plunger and bushing assembly.
tip has been eliminated and the injector output still
does not fall within its specific limits, replace the
10. Lap the sealing surfaces.
plunger and bushing with a new assembly.
11. Disassemble the injector and clean all of the parts.
NOTE: The fuel output of an injector varies
with the use of different spray tips of the same
12. Assemble the gear with the drill spot mark on the
size due to manufacturing tolerances in drilling
tooth engaged between the two marked teeth on the
the tips. If the fuel output does not fall within
rack.
the specified limits of the Fuel Output Check
13. Replace the spray tip and the plunger and bushing
Chart, try changing the spray tip. However, use
assembly to provide the correct output.
only a tip specified for the injector being tested.
11C-54