TM 5-3805-260-24TESTING 9N3979 PENCIL-TYPE FUEL INJECTIONNOZZLESTools Needed:*5P4150 Nozzle Testing Group.5P4244 Adapter.8S2270 Fuel Collector.FT1384 Extension.8S2245 Cleaning Tool Group.8S2258 Brass Wire Brush.8S2250 Nozzle Holding Tool.8S2252 Carbon Seal Installation Tool.1F1153 Needle Nose Pliers.8H8505 Combination Wrench.8H8502 Combination Wrench.8S2274 Socket.8S1589 Socket.9S5031 Socket.5P4813 Socket.5/64" Hex Wrench.5P4150 NOZZLE TESTING GROUPA. 5P4721 Tube. B. 5P4146 Gauge, 0 to 1000psi (O to 6900 kPa) used to test PC capsulevalves. C. 2P2324 Gauge, 0 to 5000 psi (O to34 500 kPa) used to test DI capsule valvesand pencil-type nozzles. D. Gauge protectorvalve for 5P4146 Gauge (B). E. Gaugeprotector valve for 2P2324 Gauge (C). F. On-off valve. G. Pump isolator valve. H.5P4720 Fitting. J. 5P8744 Adapter forcapsule nozzles. K. 5P4244 Adapter forpencil-type nozzles.EXTRA VALVEL. Gauge protector valve (must be In open positionat all times).CAUTIONBe sure to use clean SAE J967 Calibration oilwhen tests are made. Dirty test oil will damagecomponents of fuel injection nozzles. Thetemperature of the test oil must be 65 to 750 F(18 to 240 C) for good test results.Order calibration oil by part number, in thequantities needed, according to the information thatfollows:Kent-Moore Corp.1501 South Jackson St.Jackson, MI 49203Order:J-26400-5 [5 U.S. gal. (18.9 liter)]J-26400-15 [15 U.S. gal. (56.7 liter)]J-26400-30 [30 U.S. gal. (113.5 liter)]J-26400-55 [55 U.S. gal. (208.2 liter)]Viscosity Oil Company3200 South Western Ave.Chicago, IL 60608Order:Viscor Calibration Fluid1487C-SAE J-967CAvailable in 30 U.S. gal (113.5 liter) or 55 U.S.gal. (208.2 liter) drums.To test a pencil-type fuel injection nozzle, all sixsteps of the test procedure must be completed, and thestep sequence must be as follows:I.Return Leakage Test. (This test is notneeded with the 9N3979 Nozzle).II.Valve Opening Pressure Test.III.Flush the Nozzle.IV.Tip Leakage Test.V.Orifice Restriction Test.VI.Cap Leakage Test.NOTE: Do all tests before the nozzle is disassembled forcleaning, or before any adjustments are made to anozzle. A test can show that the nozzle must not beused again.Nozzle Preparation for TestBefore fuel injection nozzle (I) can be tested, allloose carbon around the tip of the nozzle must beremoved with the 8S2258 Brass Wire Brush (M).2-39
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