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Fig. 111 Pulling Exhaust Valve Insert with SE-1951 Remover
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig. 117 Cross Section of Intake and Exhaust Valves Installed in Head
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE will  be  necessary  to  grind  from  the  top  and/or  bottom  of  the seat   until   the   proper   seat   width   is   obtained   using   grinder SE1631, Figure 115. Fig. 114 Sectional View of Valves 1. Intake valve 2. Intake valve guide 3. Angle 4. A 5. B 6. Exhaust valve 7. Exhaust valve guide Fig. 115 Grinding Seats Using SE-1631 Grinder Use a 60 angle grinding stone to remove stock from the bottom of the seat (raise seat).  Use a 30 angle stone to remove stock from the top of the seat (lower seat). After the seat grinding operation has been performed, it is necessary to check the seat for run-out, Figure 116.      Seat   run-out   should   not   exceed   limits   as   shown   in specifications. Figure 116 Using Gauge from SE-1631 Tool Grinder Set for Checking Seat Run-Out It is important to have the finished seat face contact the approximate center of the valve face.  Position the valves in  the  cylinder  head.    Place  a  thin  coat  of  Prussian  Blue  on each valve face and tap the valve lightly to its seat. NOTE: This is merely for test and proof of results of  refacing  and  reseating  operations.    A poor   grind   job   cannot   be   corrected   by lapping.  Use of lapping compounds is not recommended.        A    nearly    perfect    seat often-times  is  destroyed  by  attempting  to lap the valves to their seats.  Inspect each valve  for  seat  dimensions  as  outlined  in specifications   and   make   any   necessary corrections. The corrections should always  be  made  on  the  seat  and  not  the valve face. NOTE: New valves need not be refaced; however, all valves should be carefully inspected for damaged    seat    faces    or    for    a    run-out condition  due  to  a  bent  valve  stem.    Use SE-2614 tool to determine the condition of the valve. If the ends of the valve stems are grooved or scored, they   may   be   ground   to   true   up;   however,   remove   only   a minimum amount of material.  Rechamfer as necessary. Wipe  valve  faces  and  valve  seats  with  a  cleaning solvent to remove all dirt or foreign material.  Coat the valve stems  and  faces  with  oil  and  install  the  valves  in  the  same seats  to  which  they  were  checked.    On  the  exhaust  valves, install   the   Roto-Cap   assembly,   valve   spring,   valve   stem damper, valve stem seal and CGES-210  Page 42 PRINTED IN UNITED STATES OF AMERICA

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