TM    5-2815-241-34&P CYLINDER  HEAD  -  CONTINUED ACTION LOCATION ITEM REMARKS REPAIR/ASSEMBLY  -  CONTINUED NOTE Steps 49, 50, and 51 are typical for all cylinder head valves requiring refacing. Valve refacer operating instructions are provided with the valve refacer machine. 49. 50. Valve refacer Valve (1) Insert  valve  stem  in  valve  refacer  chuck  on guide  area  of  stem  (2). Valve   (1) a. Check  valve  for  out-of-round  condition. If  runout  exceeds  0.001  inch  (0.03 mm),  valve  is  warped.  Discard  valve. b. Using  ST-685  valve  seat  grinder,  wet grind  valve  to  an  exact  30-degree  angle from  horizontal,  just  enough  to  reface completely around the valve head. If  after  grinding,  valve  head  thickness (3)  Is  less  than  0.105  Inch  (2.67 mm),  discard  valve. c. Compare refaced valve to the following table. VALVE   SPECIFICATIONS ITEM INTAKE AND NEW  MINIMUM NEW MAXIMUM WORN LIMITS EXHAUST VALVES 2 stem 3 valve head thickness 4 seat  angle 5 refacing  valve seating  area 0.4500  inch  (11.4300  mm) 0.105  inch  (2.67  mm) 30  degrees 0.0625  inch  (1.59  mm) 0.4510  inch (11.4554   mm) 30 degrees 0.4490   inch (11.4046 mm) 0.105   inch (2.67  mm) 0.0625  inch (1.59  mm) 2-206