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TM9-2815-202-34 4-38.  CYLINDER  HEAD  REPAIR (6) Valve  seat  insert  grinding (Cont) Use a valve seat grinder (84) and valve seat grinder adapter kit to grind inserts. Grind valve inserts as follows: CAUTION Do not permit grinding wheel to contact cylinder head when grinding insert. If an insert has  been  ground  until  grinding  wheel  contacts  cylinder  head,  then  install  new  insert. (a) Apply 31-degree grinding wheel on valve seat insert. (b) Grind throat of insert using 60-degree grinding wheel. (c) Grind top surface of insert with 15degree grinding wheel to narrow seat width to dimensions  shown  in  figure.  The  31-degree  face  (85)  of  insert  maybe  adjusted  relative to center of valve face (86) with 15 and 60-degree grinding wheels. NOTE Maximum  amount  exhaust  valve  should  protrude  beyond  cylinder  head  and  still maintain  proper  piston  to  valve  clearance  is  shown.  Grinding  will  reduce  thickness  of valve seat insert and cause valve to recede into cylinder head. Replace valve seat insert if valve recedes beyond limits. 4-196


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