TM 5-3805-260-24 VALVE OPENING PRESSURE (VOP) SPECIFICATIONS 1500 to 2600 psi (10, 300 to 17, 690 kPa) III. Flush the Nozzle 1. Close gauge protector valve (E). Close   on-of   valve   (F).      Open   pump isolator valve (G) NOTE:  Make  sure  nozzle  extends  inside  and  below  the top of FT1384 Extension (R). 2. Operate the pump rapidly for three full strokes. IV. Tip Leakage Test 1. Remove all fuel from the nozzle tip and body with a cloth. 2. Put a clean cloth around the top of the body     of     the     fuel     injection     nozzle (pressure   screw   end)   to   take   in   the leakage  and  prevent  any  fuel  leakage to drain down to the tip of the nozzle. CLOTH ON TOP OF NOZZLE E.  Gauge protector valve.  F.   On-otff  valve. G.  Pump Isolator valve. 3. Open  gauge  protector  valve  (E).    Be sure the nozzle tip is completely dry. 4. Make    and    hold    for    15    seconds    a pressure  of  200  psi  (1380  kPa)  less than  the  opening  pressure  measured in VOP Test II. 5. If nozzle is not within specification, DO NOT USE THE NOZZLE. TIP LEAKAGE SPECIFICATION No more than 20 drops can fall in 15 seconds V.  Orifice Restriction Test 1. Close  gauge  protector  valve  (E)  and  on-off valve  (F).    Open  pump  isolator  valve (G). 2. Point the tip of the fuel injection nozzle into the 8S2270 Fuel Collector and FT1384 Extension. 3. Make a slow increase in pressure and look at the orifice discharge pattern (shape of discharge) when fluid begins to flow through the fuel injection nozzle.    The discharge  must  be  the  same  through all  four  orifices.    Any  change,  either vertically   or   horizontally,   is   an   indi- cation of a bad nozzle. GOOD NAZZLE (USE AGAIN) TYPICAL DISCHARGE PATTER FOR ORIFICE WITH A RESTRICTION (RECONDITIONING OR REPLACEMENT NECESSARY) TYPICAL DISCHARGE PATTERN WITH HORIZONTAL DISTORTION (RECONDITIONED OR REPLACEMENT NECESSARY) 2-42