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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Servicing the Lifter
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE b. Small amount of air in oil  which can only be helped by eliminating the aeration. 3. Intermittent noise is usually the result of: a. Metal   chips   or   dirt.      Occasionally   such   material becomes  lodged  between  the  check  valve  and  seat. Cleaning will correct this condition. b. Slight  plunger  sticking  caused  by  dirt  or  varnish-like substances, which necessitates cleaning and eliminating the source of varnish. B. When engine is overhauled. Lifters  will  need  to  be  removed  and  normal  varnish deposits  cleaned  off  whenever  a  change  has  been made that will increase the distance from the cam to the valve tip.  This change may cause the plunger to be  forced  into  a  varnish  deposit  accumulated  above the  original  travel  of  the  plunger.    Since  the  plunger previously  had  not  been  required  to  operate  in  this position,  the  lifter  must  be  removed  and  cleaned  of all varnish deposits so the plunger can move freely. The following will cause increased valve train length: 1. Grinding valve tips. 2. Valve   train   parts   not   put   back   in   their   respective locations. 3. Installing new parts. Even  when  doing  a  valve  grind  job,  it  may  not  be necessary to disturb the lifters.  However, it may be found  occasionally  that  worn  valve  tips  will  need  to be ground to give a smooth surface.  In this case the length   from   cam   to   valve   tip   would   be   increased, which  necessitates  cleaning  the  lifter  as  mentioned above. As   a   general   rule,   hydraulic   lifters   should   be   left alone when they are functioning satisfactorily and the valve  train  or  gear  remains  reasonably  quiet.    The hydraulic lifter is a fairly simple positive action device   which   will   continue   to   deliver   trouble-free service under all normal engine operating conditions.        The    major    cause    of    hydraulic    lifter problems, where any exist are usually due to grit, dirt or metal chips carried to the lifter with the engine oil. To  minimize  lifter  contamination,  a  special  box  or container  should  be  used  to  store  the  lifters  when they  are  first  removed  from  the  engine  or  after  they have been cleaned and tested.  Keep the lifters in this container  until  ready  for  installation  in  the  engine. The  container  should  be  numbered  to  assure  return of the lifters to their original location in the engine. NOTE: Even when the lifters are working correctly,   there   are   other   engine   noises which are often "blamed" on lifters but can susally    be    identified.        These    may    be caused   by:   valve   stem   guide   clearance, worn timing gears, piston slap, lifter body clearance,  worn  lifter  face  or  cams,  loose main  or  rod  bearings,  worn  rocker  arms, ignition   knock,   worn   valve   tips   or   tight rocker arms. III.  Lifter Disassembly Before  disassembling  lifters  it  may  be  necessary  to remove a portion of the oil from the lifter body.  This can be accomplished by turning the tappet upside down and letting it drain  for  a  few  minutes.    Then  with  the  end  of  a  push  rod, compress  the  plunger  and  remove  the  snap  ring  located  on the inside top of the assembly. Caution  should  be  used  in  order  that  the  snap  ring does  not  "pop  out"  and  become  lost.    Removal  of  this  snap ring  should  allow  the  separate  socket  to  be  readily  removed. By   shaking   the   assembly   gently,   the   plunger   should   also come  out  unless  it  is  held  in  place  by  carbon  and  varnish deposits.    If  this  is  the  case,  some  force  will  be  required  to remove  the  plunger  from  the  body.    It  may  be  necessary  to hold   the   assembly   upside   down   and   bump   the   open   end gently  against  some  resilient  surface  (masonite,  etc.).    Care should be taken so the plunger or body will not be damaged. CGES-210  Page 46 PRINTED IN UNITED STATES OF AMERICA

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