TM 9-2320-289-343-36.FUEL INJECTOR NOZZLE TESTING (Con’t).d.CHATTER TEST1. Close shutoff lever at pressure gage.NOTE“Chatter” from new and used fuel injector nozzles (3) will vary. Whenspeed of lever movement is increased, fuel injector nozzle may “hiss” or“squeal”rather than “chatter”; this Is also acceptable. Any of thesesounds indicates that needle valve (6) moves freely and that nozzle seat,guide, and nozzle pintle (5) have no mechanical defects.2.Depress lever of fuel injector nozzletester slowly and listen for “chatter”from fuel injector nozzle (3). If no“chatter” is heard, increase speed oflever movement until fuel injectornozzle“chatters. ”Replace fuelinjectornozzleifit does not“chatter,” “hiss, ” or “squeal. ”FOLLOW-ON TASKS:l Install fuel injector nozzle, (See paragraph 3-27)TA507163-118
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