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 TM 55-1905-220-14-10
Table 5-1. Fuel system - Injector - Incorrect Fuel Output Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Incorrect fuel output (Cont).
Step 4.
Worn plunger and bushing.
After the possibility of an incorrect or faulty tip has been eliminated and the injector output still
does not fall within its specific limits, replace the plunger and bushing with a new assembly.
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 Table, try changing the spray tip. However, use only a tip
specified for the injector being tested.
Step 5.
Cracked valve parts.
Replace the cracked parts.
Step 6.
Cracked bushing.
Replace the plunger and bushing assembly.
Step 7.
Poor lapped surfaces.
Re-lap the sealing surfaces.
Step 8.
Foreign material between valve and seat. Disassemble the injector and clean the parts.
Step 9.
Rack and gear not in time.
Assemble the gear with the drill spot mark on the tooth engaged between the two marked teeth
of the rack.
5-3
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