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IGNITION SYSTEM TROUBLE SHOOTING TEST
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Test primary voltage.
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 2. Test for Spark at plug. Disconnect  high  tension  cable  from  one  spark  plug. (always  grasp  spark  plug  boot  and  use  a  twisting motion   when   removing   plug   cables   so   as   not   to destroy resistance wire termination.) Insert extension adaptor   into   boot   and   engage   in   cable   terminal. Using   insulated   pliers,   hold   plug   cable   to   create about  13  mm  (1/2")  gap  between  extension  adapter and  engine  (Figure  47).    Have  an  assistant  crank engine.  Observe for spark across gap. Test at least two cables. If spark occurs, ignition system is functioning.  Check spark plugs and ignition timing.  Then look elsewhere (engine condition, fuel system, etc.) for problem. If no spark occurs, proceed to step 3. Fig. 47  Checking for Spark at Plug 1.  Battery 3.  Ignition Coil 2.  Ignition Switch 4.  13mm (1/2 in)Gap 3. Test  for  spark  at  distributor  cap.    Disconnect  high tension cable from center tower terminal of distributor  cap.    Insert  extension  adapter  into  boot and  engage  in  cable  terminal.  (Figure  44).    Using insulated  pliers,  hold  cable  to  create  about  13mm (1/2") gap between cable terminal and engine (Figure 47).    Have  an  assistant  crank  engine.    Observe  for spark across gap. If spark occurs, problem lies in distributor cap, rotor or    spark    plug    cables.        (See    Secondary    Circuit Inspection). If no spark occurs, proceed to step 4. Fig. 48  Checking for Spark at Distributor Cap 1.  Battery 3.  Ignition Coil 2.  Ignition Switch 4.  13mm (1/2 in.) Gap 4. Check trigger wheel-to-sensor air gap Remove   distributor   cap   rotor   and   shield.      "Bump" starter to align one of the trigger wheel teeth with the sensor  coil  (trigger  wheel  tooth  perpendicular  to  flat surface  of  sensor)  as  shown  in  Fig.    49.    Check  air gap  between  trigger  wheel  tooth      and  sensor  (see SPECIFICATIONS).    If  air  gap  is  to  specifications, proceed to step 5. If  air  gap  is  out  of  specification,  adjust  air  gap  and repeat  step  3.    If  there  is  still  no  spark,  proceed  to step 5. Fig. 49  Trigger Wheel-to-Sensor Air Gap 1.  Trigger Wheel 4.  4 Cylinder Engine 2.  Sensor 5.  8 Cylinder Engine 3.  Air Gap CGES-145-U  Page 24 PRINTED IN UNITED STATES OF AMERICA

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