TM 10-3930-664-24 B. HOUSING FACE ALIGNMENT CHECK 1. Attach  dial  indicator  to  crankshaft  as  shown  in figure.  Indicator extension bar must be rigid for accurate readings.  If  the  extension  bar  sags  or the indicator slips, readings will not be accurate. CAUTION Dial   indicator   tip   must   not   enter   cap screw    holes    or    dial    indicator    will    be damaged. 2. Move dial indicator to 12 o’clock position.  Adjust dial until needle points to zero. NOTE Each  time  a  position  is  measured,  the crankshaft must be pushed toward front of   engine   to   eliminate   crankshaft   end clearance. 3. Slowly  rotate  crankshaft.  Record  dial readings at 3, 6, and 9 o’clock positions. 4. Continue  to  rotate  crankshaft  until  dial  indicator is   at   12   o’clock   position.      Check   indicator   to ensure needle points to zero. 5. Calculate  total  indicator  reading  (TIR)  as  follows (numbers are for example only): 12 O’Clock Reading - + 0.000 IN. + 3 O’Clock Reading = + 0.003 IN. + 6 O’Clock Reading = - 0.002 IN. + 9 O’Clock Reading = + 0.003 IN. Equals TIR + 0.005 IN. 6. TIR  reading  for  face  alignment  check  shall  not exceed  0.008  inch.    If  TIR  exceeds  0.008  inch, housing  face  is  out   of   alignment   and   housing must be replaced. 3-41