TM 10-3930-664-24 3. Locate top dead center (TDC) for cylinder number 1 as follows: a. Press  in  engine  timing  pin  (6)  (located  below fuel injection pump). b. Install wrench onto crankshaft pulley nut. c. Manually  rotate  crankshaft  until  timing  pin  (6) engages  hole  in  camshaft  gear.  Cylinder  1  is now at Top Dead Center (TDC) on compression stroke. d. Disengage timing pin (6). 4. Loosen lockscrew  (7).  Position special washer (8) as shown in figure.  Torque lockscrew to 6 ft-lbs (8 N•m). 5. Remove  DCA  RPM  sender  (9)  from  mechanical tachometer drive (10). 6. Remove   mechanical   tachometer   drive   (10)   from drive  adapter  (11).    Remove  and  discard  gasket (12). 7. Remove   drive   adapter   (11)   from   front   cover   by removing screws (13) and  washers  (14).    Remove and discard seal (15).  Remove hub (16). 8. Remove  screw  (17)  to  release  fuel  pump  (4)  from pump   brace   (18).      Remove   pump   brace   from engine block by removing screws (19). 3-64