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Valve guide inspection.
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Valve seat replacement
TM 5-4210-229-14&P 6-6. CYLINDER HEAD AND VALVES MAINTENANCE (Continued) (b)   Lightly   polish   valve   surface   with   extremely fine emery cloth (Appendix D, Item 13). (2)   Visually  inspect  each  valve  for  excessive  wear, burn marks,  warpage, pitting, or scuffing at valve stem    grooves,    valve    stems,    or    valve    heads. Replace  valves  which  are  seriously  bent,  worn, burnt, warped, pitted, or scuffed. INSTALLATION a.     Resurface valve face angle, if necessary. Maintain  a  minimum  valve  face  margin  of  0.068 in.(1.73 mm) for intake valves and 0.045 in.(1.14 mm) for exhaust valves. b. Set valve in grinder to desired angle. c. Dress the wheel to proper angle. d. Take a light cut off valve face angle surface. e. Replace valve if more than 0.008 in.  (0.20 mm) stock   is   removed   from   valve   face   angle   or   if margin falls below minimum specifications. f. Check  valve  face  run  out,  after  resurfacing,  with dial indicator. g. Replace valve if run out (in reference to valve stem) is greater than 0.002 in.  (0.05 mm) total variation in dial indicator reading. h. After  resurfacing  valves,  clean  valve  guides  and check  valve  face  contact  with  valve  seat  using bluing ink (Appendix D, Item 23). (1)   Spread  thin  film  of  bluing  ink  (Appendix  D, Item 23) on valve face.  Insert valve into its guide. (2)   Apply pressure on exact center of valve head, while making a quarter turn in the seat. (3)   Remove  valve,  inspect  impression  made  on seat and on valve face. (4)   Bluing   ink   (Appendix   D,   Item   23)   should appear around entire contact surface of valve face and valve seat to be acceptable.  Check several times to prevent error.  If acceptable, proceed with valve installation. NOTE If bluing ink (Appendix D, Item 23) DOES NOT show around the entire contact surface of the valve  seat,  the  angles  do  not  match  and  are unacceptable.          If     this     happens,     correct resurfacing valve seats; not valve faces. i. Valve seat resurface. (1)   Dress  the  grinding  wheel  to  correct  angle. lightly  lubricate  and  install  correct  size  pilot into valve guide bore. (2)   Lower   grinder   head   over   pilot   shank   until wheel barely clears the valve seat.  Turn on power.  Gently apply grinding wheel to valve seat with little pressure other than weight of the wheel. (3)   Raise wheel frequently to prevent overheating. (4)   Grind seat to a smooth even surface. (5)   Check    seat    concentricity,    roundness    and valve face contact using bluing ink (Appendix  D,  Item  23)  following  installation procedure  h.(6)  After  grinding  seats,  it  may be   found   that   seats   are   wider   than   the specified  width.(7)  Correct  wide  valve  seats by  grinding  top  edge  of  seat  with  a  stone mounted  on  grinder  head.    The  stone  must be   smaller   angle   (preferably   15   degrees) than the valve seat. NOTE If valve does not seat properly after resurfacing valve seats, replace valve seats. 6-10

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