Quantcast g.  Checking and Adjusting Throttle

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TM 9-2815-225-34&P 3-93.  ON-ENGINE FUEL PUMP ADJUSTMENT (Contd) LOCATION/ITEM ACTION REMARKS g.  Checking and Adjusting Throttle NOTE If throttle leakage is adjusted correctly on fuel pump test stand, fuel pump will not need to be adjusted on engine.  Vehicle throttle linkage must be adjusted so that threaded stud of throttle leakage adjusting screw (rear screw) just contacts stop on pump throttle. 21.     Engine (1) a.  Bring engine to full throttle and The purpose of the throttle allow engine to run at maximum leakage is to keep the fuel lines no-load speed. and injector drilling full of fuel during closed throttle operation. The correct throttle leakage will help acceleration when the throt- tle is opened after going down a grade.  Throttle leakage will also prevent stalling when it slows down to the idle speed.  (Too much leakage will cause slow decelera- tion.) b.  Release or move throttle quickly and start a suitable timer or stopwatch at the same time. c.  Stop timer when 1000 rpm is reached and check decelera- tion time.  Repeat this check several times. d.  Increase leakage if engine (1) begins to stall (idle governor does catch engine after deceleration from high idle). 22.     Threaded stud (27) a.  Increase leakage by turning in. b.  Recheck engine (1) deceleration until time is increased 1-2 seconds. c.  Lock threaded stud (27) with jamnut (28). d.  Recheck idle speed and readjust as necessary. e.  Set engine to high idle. f.  Check deceleration time when If deceleration time is not faster shutoff valve is closed (engine (1) by this method, throttle leakage is shut down). is not the problem.  If the deceleration time is faster by this method, throttle leakage must be reduced. 3-698


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