TM 10-3930-653-14&P (3)   MEASURING CRANKSHAFT FOR BENDING Support   both   end   journals   in   a   V-block   or   other appropriate  support,  apply  a  dial  gauge  to  the  center  of the   journal   bearing   surface,   turn   the   crankshaft   and measure  the  bend  of  the  crankshaft  (I’  of  the  maximum valve shown on the gauge is the amount of bend) If bent beyond   the   prescribed   service   limit,   straighten   with   a press, or replace the crankshaft, as required. Fig. 4-62.  Measuring Crankshaft for Bending Correct to within Service (bend) mm (in) limit mm (in) Crankshaft 0.02 (0.0008) 0.05 (0.0020) bend Note:  When    measuring  bend,  use  a dial gauge.  Bend value is half of the reading  obtained  when  crankshaft  is turned  one  full  revolution  with  a  dial gauge attached to its center journal. (4)   MEASURING END PLAY With the crankshaft installed in place and the bearing caps   tightened.      check   the   end   play   with   the   bearing caps tightened, check the end play at the center bearing. If  the  clearance  exceeds  the  limit.    replace  the  center bearing with a new one. Fig. 4-63.  Checking End Play Standard Limit End play 0.05 to 0.18 0.2 (0.0079) mm (in) (0.0020 to 0.0071) 4-2-4-10. BEARING SHELLS (1)   NSPECTING BEARING SURFACES The  upper  and  lower  bearing  are  matched  for  the front,    rear    and    center    bearings    and    should    not    be interchanged  (mixed).    (The  upper  bearing  shell  for  the rear  bearing,  for  example,  should  not  be  used  with  the lower bearing shell for the front bearing).  Make sure that the bearings are not scarred or scratched (due to entry of dirt or other abrasive matter) and that there is no sign of metal  fatigue,  peeling,  or  binding.    Replace  both  upper and lower bearing shells as a set, if faulty. 4 - 37