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DESCRIPTION - TM-5-4210-230-14P-1_551
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MAINTENANCE - TM-5-4210-230-14P-1_553
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 Trigger  wheels  of  distributors  for  four-cylinder  engines have  four  (4)  teeth.    Distributors  for  eight-cylinder  engines have eight (8) teeth on the trigger wheel. Distributor    primary    wiring    consists.    of    two    leads connected to the ignition coil primary terminals.  The red wire from the distributor connects to the coil positive (+) terminal. The   brown   wire   from   the   distributor   connects   to   the   coil negative  (-)  terminal.    (See  Figure  4).    A  third  (white)  wire from   the   distributor   connects   to   the   deceleration   throttle modulator (DTM), where used. Because primary (low voltage) current is regulated within the electronic control unit, a ballast resistor   or   resistance   wire   is   not   required   in   the   primary circuit. Fig. 4 Distributor Primary Wiring 1. From ignition switch 2. Ignition coil 3. Red wire 4. To decelerate throttle modulator (where used) 5. Brown wire 6. To governor control unit (where used) 7. Distributor The   secondary   (high   voltage)   components   are:   coil tower,  distributor  cap,  rotor,  high  tension  cables  and  spark plugs.  The new distributor cap featuring superior physical and dielectric    strength    incorporates    male    (spark    plug    type) terminals.  A resistor type rotor, interference suppression type spark  plugs  are  used  to  meet  radio  frequency  interference standards. All  distributors  have  a  mechanical  (centrifugal)  spark advance   system.      Most   distributors   also   have   a   vacuum operated   spark   advance   system.      The   advance   systems automatically  provide  the  optimum  spark  timing  for  various engine speed and load conditions. OPERATION When the ignition key is turned on, an oscillating signal is set up in the sensor circuit.  This creates a field around the sensor.  When a trigger wheel tooth enters the sensor's field, it  squelches  or  reduces  the  strength  of  the  oscillating  signal. This  weakened  sensor  signal  is  detected  by  what  is  called  a demodulator   circuit   in   the   electronic   circuit   board.      The demodulator circuit controls a transistor to turn off the current in the primary circuit of the coil.  When the transistor is turned "off",   it   opens   ("breaks")   the   coil   primary   circuit.      As   in   a conventional system, opening the coil primary circuit induces high  voltage  in  the  coil  secondary  circuit  which  is  conducted from  the  coil  to  the  distributor  cap  and  travels  through  the rotor and the secondary cables to the spark plugs.  When the trigger  wheel  tooth  leaves  the  sensor's  field,  the  transistor  is turned "on" to close ("make") the coil primary circuit. Dwell    angle    is    determined    by    the    angle    between adjacent teeth of the trigger wheel and by the air gap between the  ends  of  the  trigger  wheel  teeth  and  the  sensor.    Since there   are   no   wearing   surfaces   connected   with   the   trigger wheel   and   sensor,   dwell   remains   constant   and   should   not require adjustment for the service life of the distributor. The  mechanical  (centrifugal)  advance  system  is  built internally  into  the  distributor  and  consists  of  two  flyweights which    pivot    on    long    life,    low    friction    bearings    and    are controlled by calibrated springs which tend to hold the weights in    the    no-advance    position.    The    flyweights    respond    to changes in           _ engine (distributor shaft) speed and rotate the   trigger   wheel   to   advance   the   spark   as   engine   speed increases and retard the spark as engine speed decreases. CGES-145-U  Page 4 PRINTED IN UNITED STATES OF AMERICA

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