TM 5-3825-226-24
NOZZLE ASSEMBLY TROUBLESHOOTING GUIDE
PROBLEM
CAUSE
CORRECTION
Return Leakage High
1. Too much wear or scratches at
1. Make replacement of nozzle
guide
assembly
2. Parts are bad
2. Make replacement of nozzle
assembly
Return Leakage Low
1. Foreign material on valve
1. Clean area with solvent
2. Not enough clearance
2. Make replacement of nozzle
assembly
Opening Pressure Not Correct
1. Adjustment wrong
1. Make adjustment. See ADJUST-
MENT OF 9N3979 FUEL
NOZZLES
2. Parts are bad
2. Make replacement of nozzle
assembly
Nozzle Will Not Open
1. Orifices not open
1. Clean orifices
2. Adjustment of lift not correct
2. Make adjustment. See ADJUST-
MENT OF 9N3979 FUEL
NOZZLES
3. Valve is bad
3. Make replacement of nozzle
assembly
Tip Leakage
1. Deposits in seat area
1. Disassemble and clean nozzle.
See Special Instruction Form
2. Seat for valve bad
2. Make replacement of nozzle
assembly
3. Parts have failed
3. Make replacement of nozzle
assembly
4. Crack at tip of nozzle
4. Make replacement of nozzle
assembly
Orifice Discharge Is Not Correct
1. Orifices have a restriction or are
1. Clean orifices, if orifices are bad,
bad
make replacement of nozzle
assembly.
2. Crack at tip of nozzle
2. Make replacement of nozzle
assembly
3. Debris inside nozzle at bottom of
3. Clean nozzle. See Special In-
tip
struction Form No. SEHS7292
for cleaning procedures
4. Adjustment of lift screw not correct
4. Make adjustment. See ADJUST-
MENT OF 9N3979 FUEL
NOZZLES
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