TM 5-3895-382-24 Illustration 15 Inlet valves and exhaust valves. (1) Single valve springs Length under test force ......................39.0 mm (1.54 inch) Test force ...................................246 to 277 N (55 to 62 lb) (2) Valve spring insert for the valve spring (3) Valve guides Inside diameter of finished valve guide ........................................................... 9.00 to 9.02 mm (.354 to .355 inch) Outside diameter of inlet valve ........................................................13.03 to 13.05 mm (.513 to .514 inch) Outside diameter of exhaust valve.........................................................14.03 to 14.05 mm (.552 to .553 inch) Bore diameter in the cylinder head for the inlet valve guide ....................................13.00 to 13.03 mm (.512 to .513 inch) Bore diameter in the cylinder head for the exhaust valve guide .........................14.000 to 14.027 mm (.5512 to .5522 inch) Interference fit of valve guide in the cylinder head ........................................................0.007 to 0.047 mm (.0003 to .0019 inch) Overall length of inlet and exhaust valve guides ............................................... 51.25 mm (2.012 inch) Projection of valve guide above the valve spring recess (2)................................................14.85 to 15.15 mm (.585 to .596 inch NOTE:    When new valve guides are installed, new valves and new valve sea inserts must be installed.  The valve guides and the vale sea insets are supplied as  partially  finished  parts.    The  unfinished  valve guides   and   unfinished   valve   seat   inserts   are installed  in  the  cylinder  head.    Then,  the  guides and  insets  are  cut  and  reamed  in  one  operation with special tooling.  This procedure ensures the concentricity of the valve sea to the valve guide in order  to  create  a  seal  that  is  tight.    Refer  to  the Disassembly  and  Assembly  Manual  for  removal and installation procedures. (4) Diameter of the exhaust valve stem ............................................................ 8.94 to 8.96 mm (.352 to .353 inch) Clearance of valve in valve guide .......................................................0.040 to 0.084 mm (.0026 to .0033 inch) Maximum permissible clearance of valve in valve guide ................................................ 0.104 mm (.0041 inch) Overall length of the exhaust valve.....................................................122.65 to 123.30 mm (4.829 to 4.854 inch) (5) Diameter of the inlet valve stem .........................................................8.953 to 8.975 mm (.3525 to .3533 inch) Clearance of valve in the valve guide .......................................................0.025 to 0.069 mm (.001 to .003 inch) Maximum permissible clearance of valve in valve guide ................................................ 0.089 mm (.0035 inch) Overall length of the inlet valve.....................................................122.65 to 123.30 mm (4.829 to 4.854 inch) (6) Exhaust valve Valve face angle in a turbocharged engine  ................................................................. 30 degrees Valve seat angle in a turbocharged engine .................................................................. 31 degrees (7) Exhaust valve head diameter..................................................40.88 to 41.12 mm (1.609 to 1.619 inch) Valve depth below the cylinder head face Minimum ..............................................1.50 mm (.059 inch) Maximum .............................................1.80 mm (.071 inch) Service wear limit ...............................2.05 mm (.081 inch) 5-15