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TM 5-2420-222-34
5-1.
FUEL INJECTION NOZZLES TEST AND REPAIR (Con’t).
NOTE
If opening pressure Is correct, skip steps 4 through 8. If making second or later
adjustment, skip steps 3 and 4. If correct opening pressure cannot be obtained
after several tries, fuel Injection nozzle must be disassembled, cleaned,
inspected, and repaired.
4.
Loosen adjusting nut (4) from fuel injection nozzle (5) and pressure adjusting screw (3).
5.
Hold pressure adjusting screw (3) and loosen locknut (2) from pressure adjusting screw and lift adjusting screw (1).
6.
Tighten lift adjusting screw (1) as far as it will go into pressure adjusting screw (3).
7.
If making first adjustment, back lift adjusting screw (1) out of pressure adjusting screw (3) one full turn. If making
second or later adjustment, back lift adjusting screw out of pressure adjusting screw 12 turns.
8.
If opening pressure measured in step 3 was too low, turn pressure adjusting screw (3) clockwise to increase opening
pressure. If opening pressure was too high, turn pressure adjusting screw counterclockwise to decrease opening
pressure. Repeat steps 3 through 8.
9.
Hold pressure adjusting screw (3) to keep it from turning and torque locknut (2) to 35-45 lb.-in. (4.0-5.1 N•m). Ensure
that lift adjusting screw (1) does not turn.
10. Hold pressure adjusting screw (3) to keep it from turning and torque adjusting nut (4) to 70-80 lb.-in. (7.9-9.0 N•m).
Repeat steps 3 through 10.
NOTE
If spray pattern Is Incorrect, or fuel Injection nozzle leaks or chatters, fuel
Injection nozzle must be disassembled, cleaned, Inspected, and repaired.
11. Test spray pattern of fuel injection nozzle (5) with assembled parts (see TM 9-4910-409-12). Spray pattern should be
finely atomized, even, and cone-shaped, without gaps or irregularities.
12. Test leakage of fuel injection nozzle (5) with assembled parts (see TM 9-4910-409-12). Leakage from return end of
nozzle should be 3-10 drops in 30 seconds at 1500 psi (10,343 kPa).
13. Test chatter of fuel injection nozzle (5) with assembled parts (see TM 9-4910-409-12). Fuel injection nozzle should
chatter softly and consistently. An occasional miss is acceptable.
5-3
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