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CHART NO. 17 ENGINE DIESELS-CONTINUES TO RUN AFTER SHUT OFF (cont)
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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CHART No.  18A SPARK KNOCK OR PINGING
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 CHART NO.  18 ENGINE NOISE Noisy    engine    operation    covers    a    wide    range    of conditions;  therefore,  to  make  the  most  efficient  use  of diagnostic   aids   to   correct   the   condition,   an   accurate verification  of  the  symptoms  must  be  made .   When  the symptom is identified as to the type and general location of   the   noise,   proceed   to   the   applicable   step   outlined below.    It  can  be  seen  that  many  of  the  steps  are  based on  similar  symptoms  and,  indeed,  may  be  a  matter  of individual   interpretation .      Therefore,   if   the   most   likely step  fails  to  correct  the  condition,  proceed  to  the  next most    likely    step,    and    so    on    until    the    condition    is corrected. A. Spark Knock or Pinging This condition is characterized as being increasingly more  noticeable  as  engine  load  increases.    That  is,  at  a given   vehicle   speed   and   throttle   opening   the   problem would generally be more noticeable on a steep grade than on  a  level  surface.   The  condition  is  due  to  low  octane fuel, excessive spark advance or engine overheating. If    any    discrepancies    are    noted    in    the    following checks, repair and/or replace as required.  Advise owner of  proper  octane  fuel  and  verify  correct  spark  plug  heat range.   If engine overheating is indicated, perform steps in CHART 20, check ignition timing and check distributor mechanical    and    vacuum    advance    curve    per    CTS    * ELECTRICAL section. B. Light Clicking (Varies with Engine Speed) This    condition    is    usually    caused    by    improperly adjusted, failed or malfunctioning valve train components.  Insert feeler gauge between rocker arm and valve  stem  tip  and/or  exert  pressure  on  rocker  arm.    If noise is eliminated, adjust valve clearance to specifications.   If condition persists, inspect for worn or malfunctioning  valve  train  components .    If  no  failure  is detected,  check  for  excessive  valve  stem-to-valve  guide wear by exerting side pressure on valve stem.  If noise is corrected    excessive    wear    is    indicated.        If    valve    is eliminated   as   a   possible   cause,   check   for   accessory component  noise  by  loosening  and/  or  removing  drive belts,  one  at  a  time,  until  noise  stops .    Investigate  fuel pump and/or pump drive as possible cause. C. Sharp Rapping (Varies with Engine Speed) This  condition  is  usually  caused  by  malfunctioning hydraulic   lifter   and   may   be   located   with   the   aid   of   a stethoscope.     If  the  problem  is  not  corrected,  perform Step B. D. Hissing Inspect vacuum systems for leakage due to loose or broken connections and/or failed parts. Inspect manifolds    for    leaks.        Perform    cylinder    compression and/or leakage tests to identify and isolate cylinder head gasket leaks.  Inspect for carburetor gasket leaks. E. Sharp Snapping Noise During Acceleration Look     for     arcing     from     high     tension ignition cables. F. Squeaks and/or Squeals Loosen  drive  belts,  one  at  a  time,  to  determine  if accessory component or water pump is at fault. G. Heavy Squeal During Acceleration Check  for  accessory  drive  belt  slippage  and  adjust tension or replace as required. H. Ringing, Grinding or Combination of Both Check for loose, bent or improper pulleys.  Check for front end bracket interference between rotating parts and surrounding   components   caused   by   misalignment   of engine, engine components or surrounding components . Check  for  worn  or  damaged  water  pump  or  accessory components by loosening drive belts, one at a time, until noise stops. I. Buzzing or Whistling During Engine Operation Perform   radiator   cap   functional   check   and   verify proper  cap  sealing.     If  engine  overheating  is  indicated, perform engine overheating routine. Check for interference  with  the  fan  or  front  end  drive  components by  foreign  material,  loose  or  broken  surrounding  parts . Check for loose carburetor mounting.  Check for vacuum leaks. Check power steering. *See CTS or CGES. CGES-215  Page 34 PRINTED IN UNITED STATES OF AMERICA

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