TM 5-3895-382-24 Illustration 12 Inlet valves and exhaust valves. Double valve springs: (1) Outer spring Length under test force .....................35.8 mm (1.41 inch) Test force ...................................176 to 195 N (40 to 44 lb) (2) Inner spring Length under test force .....................34.0 mm (1.34 inch) Test force ..................................... 89 to 104 N (20 to 23 lb) Single valve springs (not shown) Length under test force ......................40.0 mm (1.57 inch) Test force....................................310 to 344 N (70 to 77 lb) Free length after test ..........................53.4 mm (2.10 inch) (3) Valve spring recess for the vale spring (4) Valve guides for the inlet and exhaust valves Inside diameter ......................................... 9.51 to 9.56 mm (.374 to .376 inch) Outside diameter ..............................15.900 to 15.910 mm (.6260 to .6265 inch) Bore diameter in cylinder head for valve guide ......................15.87 to 15.89 mm (.625 to .626 inch) Interference fit of valve guide in cylinder head  ..........................0.03 to 0.07 mm (.001 to .003 inch) Overall length of valve guide Inlet ................................................. 57.94 mm  (2.281 inch) Exhaust ..............................................61.1 mm (2.406 inch) Projection of valve guide above valve spring recess (3) .............................................15.1 mm (.595 inch) NOTE:    When new valve guides are installed, new valves and new valve seat inserts must be installed.  The valve   guides   and   the   valve   seat   inserts   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 inserts are cut and reamed in one operation  with  special  tooling.    This  procedure ensures the concentricity of the valve seat to the valve guide in order to create a sea that is tight. Refer  to  the  Disassembly  and  Assembly  Manual for removal and installation procedures. (5) Diameter of the exhaust valve stem ............................................................. 9.43 to 9.46 mm (.371 to .372 inch) Clearance of valve in valve guide ...................... 0.05 to 0.13 mm (.002 to .005 inch) Maximum permissible clearance of valve in valve guide  ................................................................0.15 mm (.006 inch) Overall length of the exhaust valve ..............................................................123.07 to 123.57 mm (4.845 to 4.865 inch) (6) Diameter of the inlet valve stem ........................................................9.460 to 9.490 mm (.3724 to .3735 inch) Clearance of valve in the valve guide  ...................................................................... 0.02 to 0.10 mm (.001 to .004 inch) Maximum permissible clearance of valve in valve guide  ................................................................0.13 mm (.005 inch) Overall length of the inlet valve   ..............................................................122.66 to 123.07 mm (4.829 to 4.845 inch) (7) Exhaust valve face angle ................................. 45 degrees Valve seat angle ................................................ 46 degrees (8) Diameter of the exhaust valve ........................................................37.26 to 37.52 mm (1.467 to 1.477 inch) Valve depth below the cylinder head face Minimum ...........................................................1.28 mm (.050 inch) Maximum ..........................................................1.83 mm (.072 inch) Service wear limit............................................2.08 mm (.082 inch) (9) Diameter of the inlet valve ...................44.86 to 45.11 mm (1.766 to 1.776 inch) Valve depth below the cylinder head face Minimum ...........................................................1.27 mm (.050 inch) 5-13