TM 5-3895-359-14&P
TROUBLE SHOOTING CHARTS (Needle Valve Injectors)
Chart 1
LOW OR HIGH VALVE OPENING PRESSURE
LOW VALVE OPENING PRESSURE
HIGH VALVE OPENING PRESSURE
Probable Cause
Probable Cause
1. WORN OR ERODED NEEDLE VALVE
6. CARBON OR FOREIGN MATERIAL
OR VALVE SEAT IN SPRAY TIP
IN SPRAY TIP
2. WORN OR DAMAGED NEEDLE
7. CARBON IN SPRAY TIP ORIFICES
VALVE QUILL
3. WORN OR DAMAGED NEEDLE
VALVE SPRING SEAT
4. WORN OR BROKEN VALVE SPRING
5. DIRT OR FOREIGN MATERIAL
IN INJECTOR
SUGGESTED REMEDY
1. Replace the needle valve and spray tip assembly.
6. Remove the carbon in the spray tip with tip reamer
J 9464-01 which is especially designed and ground for
2. Replace the needle valve and spray tip assembly.
this purpose.
3. Replace the spring seat.
7. Check the size of the spray tip orifices. Then, using
tool J 4298-1 with the proper size wire, clean the
orifices.
4. Replace the valve spring.
5. Disassemble the injector and clean all of the parts
10-3-59
