TM    5-2815-241-34&P CYLINDER  HEAD  -  CONTINUED ACTION LOCATION ITEM REMARKS REPAIR/ASSEMBLY - CONTINUED CAUTION Do not apply side pressure to ST-685 valve seat grinder motor. This action will cause the valve seat to be ground off-center. NOTE Steps 32, 33, and 34 are typical for all cylinder head valve seat inserts marked for regrinding. 32 .   Cylinder  head  (1) 33. 34. Valve seat insert  (2) a. Using  ST-685  valve  seat  grinder  and  the correct  arbor  from  ST-663  valve  guide arbor set, grind valve seat inserts to specifications    below. b. Check seat width. It should be no smaller than dimension A and no larger than  dimension  B. If seat width is wider than dimension B, material can be removed from points (3) and (4) with specially dressed grind stones. Narrowing should  not  extend  beyond  chamfer  on valve seat insert. Chamfer provides metal for staking insert Into cylinder head. Using   eccentricimeter   (5),   check   valve seat  insert  runout.  Total  runout  should  not exceed  0.002  inch  (0.05  mm). if runout exceeds this measurement, repeat  step  32. a. Remove  all  tools  from  valve  seat  insert. b. Clean   cylinder   head.   See   General Maintenance    Instructions,    page    2-3. 2-198