TM 5-3825-226-24
TYPICAL DISCHARGE PATTERN WITH VERTICAL
DISTORTION
(RECONDITIONING OR REPLACEMENT
NECESSARY)
VI. Cap Leakage Test
1. Remove fuel injection nozzle (I) from the 5P4150
Nozzle Tester and put it in 8S2250 'Nozzle Holding
Tool (P).
NOZZLE CAP INSTALLATION
1. Fuel Injection nozzle. 4. Cap. 7. 1H1023 O-ring seal.
2. Install new IH 1023 O-ring Seal (7).
3. Install cap (4) and tighten to 110 to 120 lb.. in. (12.4
to 13.6 N-m).
TIGHTENING CAP
8. 9S5031 Socket. P. 8S2250 Nozzle Holding Tool.
CAUTION
Do not tighten the cap more than torque shown
or the new O-ring seal will be damaged.
4. Put fuel injection nozzle (1) on the 5P4150 Nozzle
Tester with the nozzle tip in the 8S2270 Fuel
Collector and FT1384 Extension.
5. With gauge protector valve (E) open, pump the
tester until cap (4) is completely full of fuel and the
pressure on the gauge is 4000 psi 27 500 k Pa).
NOTE: 15 to 20 strokes of the pump can be
necessary for the pressure to reach 4000 psi (27
500 kPa).
CAP LEAKAGE SPECIFICATION
There must be no leakage between the cap and the
body of fuel injection nozzle.
There must be no leakage between the cap and the
body of fuel injection nozzle.
6. If there is leakage, make a replacement of I H 1023
Seal (7) and inspect cap (4) for cracks. Test the
nozzle again. If there is still leakage, replacement
of fuel injection nozzle is necessary.
INSTALLING CARBON DAM
2. Carbon dam. 3. Seal. N. 8S2252 Carbon Seal Tool.
7. If no fuel leakage is found, fuel injection nozzle is
acceptable. Slide new seal (3) into position over the
nozzle. Install new carbon dam (2) ·in nozzle
groove with 8S2252 Carbon Seal Tool (N).
TROUBLESHOOTING OF 9N3979 FUEL INJECTION
NOZZLES
Use the guide that follows to troubleshoot for
problems with the pencil-type fuel injection nozzles.
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