F U E L S Y S T E M5. If the nozzle is not within specifications, DONOT USE THE NOZZLE.IV. Orifice Restriction Test1.2.3.Close gauge protector valve (E) and on-off valve(H). Open pump isolator valve (K).Point the tip of the fuel injection nozzle into the8S2270 Fuel Collector and FT 1384 Extension.Be sure the bleed screw hole is positioned towardthe tester and is in line with 6V2170 Tube As-sembly (C). This will make the fuel injectionnozzle be 15° from vertical and the spray pat-tern will be horizontal.Make a slow increase in pressure and look at theorifice discharge pattern (shape of discharge)when fluid begins to flow through the fuel injec-tion nozzle. The discharge must be the samethrough all nine orifices. Any change either ver-tically or horizontally, is an indication of a badnozzle.T Y P I C A L D I S C H A R G E P A T T E R N F O R O R I F I CEW I T H A R E S T R I C T I ON( R E P L A C E M E N T N E C E S S A R Y )T Y P I C A L D I S C H A R G E P A T T E R N W I T H H O R I Z O N T A LD I S T O R T I O N( R E P L A C E M E N T N E C E S S A R Y )TM 5-3805-258-24-1T E S T I N G A N D A D J U S T I N GT Y P I C A L D I S C H A R G E P A T T E R N W I T H V E R T I C A LD I S T O R T I ON( R E P L A C E M E N T N E C E S S A R Y)V. Bleed Screw Leakage Test1. Install bleed screw and seal (4) in fuel injectionnozzle. Tighten the bleed screw to a torque of1.8 ± 0.2 N·m (16 ± 2 lb. in.).CAUTIONDo not tighten the bleed screw more than thetorque shown. The bleed screw or seal can bedamaged.2.3.4.Put the tip of the fuel injection nozzle downinside the 8S2270 Fuel Collector and FT1384Extension.Close on-off valve (H). Open gauge protectorvalve (E) and pump isolator valve (K).Pump the tester until fuel injection nozzle is fullof fluid and the pressure on-the gauge is 27500kPa (4000 psi).NOTE: 15 or 20 strokes of the pump can be neces-sary for the pressure to get to 27500 kPa (4000 psi).BLEED SCREW LEAKAGE SPECIFICATIONThere must be no leakage between the bleed screw andthe body of the fuel injection nozzle.5. If there is leakage, replace the 1W8616 Seal.Inspect the washer face of the bolt for damage,replace if needed. Test the nozzle again. If thereis still leakage, the fuel injection nozzle must bereplaced.6. If no fuel leakage is found, the fuel injectionnozzle is acceptable. Put a new seal (3) on thenozzle. Install a new carbon dam (2) in nozzlegroove with 6V4979 Carbon Seal Tool (N).4-9
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