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 TM 55-1905-220-14-10
Table 5-2. Fuel system - Injector -Low or High Valve Opening Pressure Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Low valve opening pressure.
Step 1.
Worn or eroded needle valve or valve seat in tip.
Replace the needle valve and tip assembly.
Step 2.
Worn or damaged needle valve quill.
Replace the needle valve and tip assembly.
Step 3.
Worn or damaged needle valve spring seat.
Replace the spring seat.
Step 4.
Worn or broken valve spring.
Replace the valve spring.
Step 5.
Dirt or foreign material in injector.
Disassemble the injector and clean the parts.
2. High valve opening pressure.
Step 1.
Carbon or foreign material in spray tip.
Carbon in the tip should be removed with tip reamer J9464 which is especially designed and
ground for this purpose.
Step 2.
Carbon in tip orifices.
Check the hole size of the spray tip orifices. Then, using tool J4298-1 with the proper size wire,
clean the orifices.
5-4
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