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Page Title: TEST AND ADJUSTMENT (cont)
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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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