TM 5-3805-260-24 NOZZLE POSITION FOR RETURN LEAKAGE TEST 1.  Fuel injection nozzle.  Q.  5P4244 Adapter. R.  FT1384 Extension.  S.  8S2270 Fuel Collector. 5. Close on-off valve (F).  Open pump isolator valve (G). 6. Open gauge protector valve (E) and operate the tester slowly until the pressure is at 1400 to 1600 psi (9630 to I 1 045 kPa). 7. Look at the leakage from the return at the top (pressure screw end) of the fuel injection nozzle. RETURN LEAKAGE SPECIFICATION Minimum Maximum After the first No No drop falls: Minimum Maximum II. Valve Opening Pressure Test (VOP) 1. Loosen nut (5) and turn nozzle tip down so that it extends into FT1384 Extension  (R) as shown. 2. Tighten nut (5) to 5P4244 Adapter (Q). Nut (5) can be tightened by hand if 1 1023 O-ring Seal (6) is not damaged. NOZZLE CONNECTED TO 5P4150 NOZZLE TESTER WARNING When fuel injection nozzles are tested, be sure to wear eye protection.  Fuel comes from the orifices in the nozzle tip with high pressure.  The fuel can pierce (go thru) the skin and cause serious injury to the operator. Keep the tip of the nozzle pointed away from the operator and into the 8S2270 Fuel Collector and FT1384 Extension. NOZZLE READY FOR TEST E.  Gauge protector valve.  F.  On-off valve. G.  Pump isolator valve. CAUTION Put  a  shop  towel  around  the  top  of  the  nozzle (pressure    screw    end)    to    take    in    any    fuel leakage. 3. Close on-off valve (F).  Open pump isolator valve (G). 4. Open  gauge  protector  valve  (E).    Operate the    pump    to    make    a    slow    increase    in pressure until the valve in the fuel injection nozzle    just    starts    to    open.        Read    the maximum   gauge   pressure   at   the   instant fluid flows from the tip. NOTE:   It   is   possible   for   the   pressure   reading   of   the gauge   to   go   down   fast   if   the   valve   makes   a   noise (chatters)   when   it   opens.      It   is   also   possible   for   the pressure  reading  of  the  gauge   to   be   almost   constant when the valve in the fuel injection nozzle opens. NOTE: The salve in the fuel injection nozzle can be good and still not make a noise (chatter).   or  not  have  a  very fine  vapor  (spray)  from  the  orifices  in  the  tip  of  the  fuel injection nozzle during Step 4. If  the  opening  pressure  is  less  than  1500   psi 10300  kPa),  do  not  use  the  fuel  injection  nozzle  again. 2-41