F  U  E  L   S  Y  S  T  E  M 5. If the nozzle is not within specifications, DO NOT  USE  THE  NOZZLE. IV. Orifice Restriction Test 1. 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 the 8S2270 Fuel Collector and FT 1384 Extension. Be sure the bleed screw hole is positioned toward the tester and is in line with 6V2170 Tube As- sembly (C). This will make the fuel injection nozzle be 15° from vertical and the spray pat- tern will be horizontal. Make a slow increase in pressure and look at the orifice discharge pattern (shape of discharge) when fluid begins to flow through the fuel injec- tion nozzle. The discharge must be the same through all nine orifices. Any change either ver- tically or horizontally, is an indication of a bad nozzle. 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 CE W 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 L D 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  5-3805-258-24-1 T E S T I N G  A N D  A D J U S T I N G 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      V E R T I C A L D 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 Test 1. Install bleed screw and seal (4) in fuel injection nozzle. Tighten the bleed screw to a torque of 1.8 ± 0.2 N·m (16 ± 2 lb. in.). CAUTION Do not tighten the bleed screw more than the torque shown. The bleed screw or seal can be damaged. 2. 3. 4. Put the tip of the fuel injection nozzle down inside the 8S2270 Fuel Collector and FT1384 Extension. Close on-off valve (H). Open gauge protector valve (E) and pump isolator valve (K). Pump the tester until fuel injection nozzle is full of fluid and the pressure on-the gauge is 27500 kPa  (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  SPECIFICATION There  must  be  no  leakage  between  the  bleed  screw  and the  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 there is still leakage, the fuel injection nozzle must be replaced. 6. If no fuel leakage is found, the fuel injection nozzle is acceptable. Put a new seal (3) on the nozzle. Install a new carbon dam (2) in nozzle groove with 6V4979 Carbon Seal Tool (N). 4-9