TM 5-3805-262-34ADJUSTING OPENING PRESSUREa. Test Stand Preparation.(1) Open gage valve.(2) Fill supply cup with diesel fuel.(3) Operate pump handle to remove air from system; to ventilate system, openvent screw located directly behind lower discharge fitting.b. Connect fuel injector to upper discharge fitting using test stand adapters andelbow. Be sure nozzle tip assembly is facing downward.NOTEWhen testing more than one fuel injector, there shall not be more than100 psi difference in opening pressure between injectors.c. Check fuel injector opening pressure as follows:(1)Close gage valve.Always direct injector tip away from you. Fuel from spray orifices canpenetrate clothing and skin causing serious infection. Always be sureinjector tip is enclosed in a receptacle (preferably transparent) tocontain spray. If skin is broken by fuel injector spray, immediatelywash injured part with boric acid solution.Support injured member witha splint and sling so it will remain absolutely at rest. Obtain medicalattention immediately.(2) Flush fuel injector by working test stand handle rapidly.(3) Open gage valve and raise pressure slowly until fuel injector valve opens(pressure gage reading will fall sharply at this point). Record openingpressure.(4) If opening pressure is not 3400 to 3950 psi for used injectors or 3950 to4100 psi for new injectors, go to step (5) below. If opening pressure iswithin above range, go to step (9) below.(5) Remove fuel injector from test stand and disassemble fuel injector (page4-80).NOTEOne shim kit contains enough pressure adjusting shims to adjust sixinjector nozzles.(6)Using shim kit, add pressure adjusting shims to increase opening pressureor remove pressure adjusting shims to decrease opening pressure.(7) Reassemble fuel injector (page 4-84) .(8) Repeat steps b and c(1) through (4) above.(9) Test fuel injectors (page 3-110).4-85
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