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Check Engine Bolt Torque and Tighten if Necessary
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  42  Vacuum Chamber Details
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 e. Measure battery terminal D.C. voltage with engine at idle speed and record. f. If  coil  positive  terminal  voltage  is  less  than  battery terminal  voltage  by  more  than  .5  volts,  replace  or repair    primary    wiring,    ignition    switch    or    firewall connector as required.  Recheck coil output voltage. If not satisfactory, proceed as follows: g. Measure    ignition    coil    primary    resistance.        The resistance from positive terminal to negative terminal with  ignition  switch  off  should  measure  between  1.2 and  1.4  ohms.    If  resistance  is  outside  these  limits, replace coil. h. Measure   secondary   resistance   of   ignition   coil   by measuring   between   the   positive   terminal   and   the secondary  tower  connector.    The  resistance  should measure  between  9.4  and  11.1  thousand  ohms.    If the resistance is outside these limits, replace coil. i. Off-Engine   Coil   Check:   The   ignition   coil   can   be removed   from   the   engine   and   checked   with   SE2576   or equivalent test equipment. 11.   Check Initial Advance and Adjust if necessary. a. Connect timing light. b. Disconnect and plug vacuum advance hose. c. Start    engine    and    operate    until    normal    operating temperatures are reached. d. Observe  engine  idle  speed.    Speed  must  be  within specifications   (see   Tune-Up   Specifications);   adjust speed to specifications, if necessary. e. Observe initial advance with timing light. f. Loosen distributor clamp and adjust to specifications, if necessary (see Emission Control System Tune-Up Specifications).          Tighten     distributor     clamp     and recheck initial advance. Fig.  40  Typical Location of Timing Marks g. MV-446   engine,   reconnect   vacuum   advance   hose and    adjust    speed    to    Tune-Up    Specification,    if necessary. Other engines, adjust speed to specifications with vacuum advance hose disconnected (Step b). h. Stop  engine.    Reconnect  vacuum  advance  hose  (if necessary) and remove timing light. 12.   Check    Operation    of    Inlet    Air    System    Valve    and Service or Replace, if necessary. Procedure   for   servicing   the   sensor   controlled   vacuum chamber type air cleaner is as follows: (Canada Scout Vehicles) a. Test should be conducted when ambient temperature of the vehicle is less than 24 deg. C (75 deg. F) and engine started cold.  Air cleaner must have all hoses, piping and cover in place.  No leaks permitted. Fig.  41  Sensor Controlled Vacuum Chamber Type Air Cleaner CGES-215  Page 24 PRINTED IN UNIT ED STATES OF AMERICA

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