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Fig.  43 Trigger Wheel-to-Sensor Air Gap
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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IGNITION SYSTEM TROUBLE SHOOTING TEST
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 DISTRIBUTOR INSTALLATION 1. Clean distributor mounting area of engine block. 2. Install a new distributor mounting gasket in counterbore of engine block or install a new "O" ring seal on distributor housing, whichever is applicable. 3. Position   distributor   in   engine.      If   engine   was   not rotated while distributor was removed - a. Align rotor tip with mark scribed on distributor housing during removal.  Then, on distributors with   driven   gear   mounted   on   lower   end   of distributor   shaft,   turn   rotor   about   1/8   turn clockwise past scribed mark. b. Slide distributor down into engine and position distributor housing in approximately the same location   (in   relation   to   surrounding   engine parts) as when removed. It  may  be  necessary  to  move  rotor  and  shaft slightly  to  start  gear  into  mesh  with  camshaft gear  and/or  to  engage  oil  pump  shaft  drive tang, but rotor should align with scribed mark when distributor is down in place. c. Install  distributor  hold-down  clamp,  bolt  and lock washer, but do not tighten bolt. If engine was rotated while distributor was removed, it will be necessary to re-establish timing as follows - a.     Remove No.  1 spark plug (No.  8 on V-304, V-345,   V-392   engines).      Hold   finger   over spark    plug    hole    and    rotate    engine    until compression pressure is felt.  Slowly continue to rotate engine until timing mark on crankshaft pulley lines up with specified initial timing  mark  on  timing  quadrant.    (For  initial timing  setting,  refer  to  tune-up  data  decal  on engine.)    Always  rotate  engine  in  direction  of normal rotation.  Do not "back" engine to align timing marks. b.     Turn  distributor  shaft  until  rotor  tip  points  in the   direction   of   the   No.      1   terminal   in   the distributor  cap  (No.    8  terminal  on  V-304,  V- 345,   V-392   engines).   Then,   on   distributors with  driven  gear  mounted  on  lower  end,  of distributor   shaft,   turn   rotor   about   1/8   turn clockwise     past     position     of     initial     timing terminal. c. Slide distributor down into engine and position distributor housing in approximately the same location   (in   relation   to   surrounding   engine parts) as when removed. It  may  be  necessary  to  move  rotor  and  shaft slightly  to  start  gear  into  mesh  with  camshaft gear  and/or  to  engage  oil  pump  shaft  drive tang, but rotor should align with the position of initial timing terminal when distributor is down in place. d. Install  distributor  hold-down  clamp,  bolt  and lock washer, but do not tighten bolt. 4. Install  distributor  cap  (with  high  tension  cables)  on distributor   housing   making   sure   tang   on   vacuum advance  unit  aligns  with  slot  in  distributor  cap  and that cap fits down snug on distributor housing. IMPORTANT If  distributor  cap  is  incorrectly  positioned on  distributor  housing,  cap  or  rotor  may be damaged when engine is cranked. 5. Connect  distributor  primary  wiring  as  follows:  (See Figure 4) a. Connect brown  distributor  lead  to  ignition  coil negative (-) terminal. b. Connect  red   distributor   lead   to   ignition   coil positive (+) terminal. c. Connect  deceleration  throttle  modulator  lead (white    wire)    to    harness    connector    (where used). 6. Connect tachometer drive cable, if equipped. CGES-145-U  Page 22 PRINTED IN UNITED STATES OF AMERICA

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