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INSPECTION (cont) - TM-5-4210-229-14P_401
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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INSTALLATION - TM-5-4210-229-14P_403
TM 5-4210-229-14&P 6-6. CYLINDER HEAD AND VALVES MAINTENANCE (Continued) NOTE Valve    guides    must    be    thoroughly    cleaned prior to valve installation. (1)   Coat  a  brush  (Appendix  D,  Item  9)  (which  has  a slightly larger diameter than the I.D.  of the valve guide) with soap and water. (2)   Insert  brush  into  I.D.    of  valve  guide  and  with  a turning  motion,  run  the  brush  through  to  insure removal    of    gum,    carbon    deposits    and    rust preventive from the guide and spiral groove. NOTE When  installing  valves  and  retainers  do  not use   grease.      Grease   may   stop   the   flow   of lubricating  oil  into  the  valve  guide  and  cause valve guide wear. (3) Thoroughly  coat  guide  with  clean  lubricating  oil (Appendix D, Item 37) after cleaning operation is complete. AlI valve guides furnished as replacement parts  are  reamed  to  size;  however  it  is necessary   to   ream   guides   to   specified size after installation to remove any burrs or slight distortion caused by the pressing operation.  Be extremely careful not to remove too much material.  Always clean guides after this operation. (4) After   cleaning   all   valve   guide   bores,   position alight  at  bottom  of  valve  guide  bore;  examine walls for burning, cracking or excessive wear. (5) Measure  I.D.    of  valve  guide  at  several  points. Valve guide I.D.  maximum limits are: 0.3750 in.        (9.525 mm) (6) Replace  any  guides  which   are   burned,   cracked, worn beyond limits, or without rifling. (a)   Remove valve guides with valve guide remover. NOTE Install  valve  guides  with  (internal)  threaded portion down.  The 30 degree chamfer at the top of the guide is intended to allow excess oil  to  drain  away  from  the  top  of  the  guide and    the    threads    are    intended    only    to distribute   the   small   amount   of   oil   which enters    the    guide,    not    to    introduce    oil. Inverting  the  guides  can  lead  to  excessive oil consumption. (b) Use   valve   guide   installer    to   install   new   guide. Keep   valve   guide   recession   from   cylinder   head surface at the maximum limits specified. INTAKE                        EXHAUST 1.227 in (31.17 mm)            1.307 in (32.20 mm) c. Valves inspection. (1) Remove residue from valve springs, valve head and stem. Cleaning  solvent,  (Appendix  D,  Item  54),  is both   toxic   and   flammable.      Keep   off   skin. Use  only  in  a  well-ventilated  area  and  avoid prolonged  breathing  of  vapors.    Keep  away from open flames. Do   not   use   steel   brushes,   for   these   will scratch the surface and lead to valve failure. (a)   Clean  with  solvent  (Appendix  D,  Item  54)  and  a brass wire brush (Appendix D, Item 7). 6-9

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