TM 5-3805-262-343-2.FUELSYSTEMMAINTENANCE(CONT)a. Fuel Injector Nozzles (Cont ) .TESTING (SHEET 3 OF 3)(8) Check fuel injector spray pattern as follows:(a) Disconnect fuel injector from upper discharge fitting and connect to lo-wer discharge fitting.(b) Close gage valve.NOTEFuel injector will chatter when tester is operated rapidly. Chatter isan indication of valve freedom, good seat width, and interference angle.This chatter can change between fuel injectors. Chatter between fuelinjectors must not be compared for purpose of making fuel injectorsacceptable or not acceptable.FINE ATOMIZED SPRAY PATTERNSOLID IRREGULAR SPRAY PATTERN(c) Operate tester at 60 strokes per minute and watch spray pattern. Ifspray pattern is finely atomized, fuel injector is operating properly.If spray pattern is solid and irregular, notify general support mainte-nance (fuel injector must be repaired).3-112
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