TM 5-3805-260-24 2. Turn the crankshaft COUNTERCLOCKWISE (as seen from rear of engine) until No.  1 Piston is at top   center   on   the   compression   stroke.      The TDC-I  mark  on  the  damper  assembly  will  be  in alignment with the timing pointer. 3. Make adjustment to the valves for No. 1 and No 2. cylinders.  To make the adjustment, loose nut (2).      Turn   the   adjustment   screw   (1)   until   the feeler  gauge  (3)  will  go  between  the  end  valve stem and the rocker arm. VALVE LASH ADJUSTMENT 1.  Adjustment screw.  2.  Locknut.  3.  Feeler gauge. 4 .After the adjustment is complete, hold adjustment  screw  (1)  and  tighten  locknut  (2)  to 24 + (32 + 7 N.m).  After the locknut is tightened check the adjustment again. 5. Turn the crankshaft 180° COUNTERCLOCKWISE  (as  seen  from  rear  of engine).  The VS mark on the damper assembly will be in alignment with the timing pointer.  Make adjustment to the for No.  3 and No.  7 cylinders. 6. Turn the crankshaft 1800 COUNTERCLOCKWISE  (as  seen  from  rear  of engine).  The mark on the damper assembly will be  in  alignment  with  the  timing  pointer.    Make adjustment   valves   for   No.      4   and   No.      5 cylinders. TIGHTENING LOCKNUT 7. Turn the crankshaft 180° COUNTERCLOCKWISE  (as  seen  from  rear  of engine).  The VS mark on damper assembly will be  in  alignment  with  the  timing  pointer.    Make adjustment   to   the   vale   No.      6   and   No.      8 cylinders. When the adjustment of the valve  lash  needs  done several times in a short period of time, it  car indication of wear  in  a  different  part  of  the    engine  the  problem  and make any necessary  repairs to prevent more damage to the engine. Not enough valve lash,  if not corrected,  can be the cause of rapid wear of the camshaft and cam followers. Not enough valve lash can also be an indication of the seats for the valves being bad.  Some reasons for the seats for the valves becoming bad are fuel injection nozzles with defects,  restriction to the inlet air or air filters,  wrong fuel setting,  or using the engine loads that are too large for the engine. Too much valve lash,  if not corrected,  can be the cause for broken valve stems,  push rods,  or retainers. A fast increase in valve lash can be an indication of any of the following: a. Camshaft and cam follower with wear. b. Rocker arms with wear. c. Push rot's that are bent. d. Loose adjustment screw for the valve 1a e. Broken socket on the upper end of a push If the camshaft and cam followers show  signs of rapid wear, look for fuel in the lubrication oil or dirty lubrication oil as a possible cause when making necessary repairs. 2-66