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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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ENCLOSED SHIFT LEVER TYPE STANDARD DUTY
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL INSTALLATION When installing spark plugs, always be sure gasket seats and threads are clean. Using a torque wrench, tighten plugs to 2830 ft.  lbs. BOOSTER GAP PLUG For the past several years auxiliary gap (Booster Gap) spark plugs have been used in certain IH engines, Fig.  19 Prior   to   IH   approval,   the   Booster   Gap   design   was thoroughly   tested   and   evaluated,   at   which   time   their   anti- fouling characteristics were firmly established. What is a Booster Gap plug? This plug has an internal air gap between the center electrode and the terminal stud. How do they work? Most  servicemen  know  that  misfire  will  occur  when  a conventional spark plug is fouled. As the coil attempts to build up voltage on the "dirty" firing end, it "sees" an easier path to ground over the deposits.  This short circuit prevents normal voltage buildup.  The Booster Gap, however, isolates the coil from the fouling deposits, allowing near normal voltage build- up.    The  instant  the  Booster  Gap  sparks,  sufficient  voltage appears   across   the   firing   gap   and   normal   ignition   results. When you remove a plug wire from a fouled plug and let the spark  jump  from  the  cable  to  the  plug  terminal  to  make  the plug fire, you are using this same Booster Gap principle. Where are Booster Gap plugs used? Maximum    benefit    from    this    design    is    obtained    in engines that operate over a wide load and speed range.  For example,  a  heat  range  cool  enough  for  highway  service  will have  better  fouling  protection  during  stop-start  city  delivery service with the Booster Gap. Furthermore, the Booster Gap has been instrumental in reducing the complaints of "break-in fouling" in new engines. In   many   cases   misfire   due   to   oil   fouling   in   older engines  can  be  relieved  simply  by  using  the  recommended heat range plug incorporating a Booster Gap. A cure-all? Not at all. Booster Gap plugs used where recommended  and  applicable  to  help  solve  fouling  problems will  give  excellent  results.  However,  the  need  for  the  correct selection  of  plugs  in  the  proper  heat  range  based  on  type  of vehicle operation is important. Where more severe conditions of fouling as a result of light service application or break-in fouling on engines occurs, the alternate recommended hotter type plug with Booster Gap should be used. Voltage Requirements While    nominal    in    amount,    the    Booster    Gap    does require  more  voltage  initially  than  conventional  spark  plugs. This   higher   requirement   diminishes,   however,   after   several thousand miles of use. Most   any   ignition   system   has   more   than   adequate reserve  to  supply  the  bit  of  extra  voltage  requirement;  if  you experience   misfiring   with   Booster   Gap   plugs   and   not   with conventional    plugs,    chances    are    the    ignition    system    is marginal. It  should  also  be  pointed  out  that  Booster  Gap  plugs are  not  resistor  plugs.    If  radio  interference  is  a  problem  on older  vehicles  having  nonresistor  ignition  cables,  it  may  be necessary  to  install  resistance  leads  (cables).  Booster  Gap plugs may be used in conjunction with resistance-type ignition cables  to  obtain  interference  suppression  and  still  obtain  the added  benefits  of  the  Booster  Gap.    This  is  the  combination that  is  recommended  on  all  gasoline  powered  motor  truck engines. CTS-2016-J  Page 8 PRINTED IN UNITED STATES OF AMERICA

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