TM 5-4320-302-145-16.FUEL INJECTORS (CONT)Location/ItemActionRemarks6.Bosch pumpMake sure pressure valve is turned all the way clock-outfit No.wise and closed. Pump up air pressure in unit by003-3345pumping the pump hand lever up and down severaltimes.7.Pump outfit,Slowly turn pressure valve counterclockwise. As thepressure valve,valve starts to open, read fuel injection pressure oninjector, andgage. Continue to open valve to increase fuel injectionnozzlepressure to injector until fuel sprays out of nozzle.Read and record injection pressure. Injection pressureshould be 2611 to 2727 psi (18 000 to 18 800 kPa)for a new injector, or 2538 to 2654 psi (17 500 to18 300 kPa) for an injector in operation and beingtested. Injection pressure may be adjusted if it doesnot fall within the limits above. Refer injector togeneral support for adjustment or repair, and replaceinjector.8.Injector andCheck fuel spray pattern from injector nozzle. Fuelnozzleshould spray out in several evenly spaced jets ofequal thickness and with no mist surrounding thejets. If spray pattern does not conform to above,refer injector to general support for repair, andreplace injector. If injector nozzle drips fuel atapproximately 2100 to 2360 psi (14 500 to16 300 kPa) before it has reached recommendedinjection pressure, refer injector to general supportfor repair, and replace injector. If nozzle dripsfuel after injection pressure test, refer injector togeneral support for repair, and replace injector.5-46
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