TM 55-2840-241-23 Table   4-1.   Troubleshooting   (Continued) Item Trouble Probable    cause Remedy 47 48 49 50 Oil   leakage   during shutdown   periods (smoking   on shutdown.)   (Also refer  to  items  40  and 41.) Static   oil   leakage from  power  and accessory   gearbox breather. Oil   leaking   from weep  holes  at  gas producer   fuel   control and/or   power   turbine fuel   governor. Starter   unable   to rotate   engine immediately    after shutdown. 50.1   Starter   unable   to rotate   engine (cold). a.   Oil   leakage   from compressor    forward bearing   seal. b.   Oil   leakage   from turbine   or   combustion section. Internal   check   valve stuck. Check  engine  oil  seal. Turbine   blade   tip clearance. a.  Replace  engine.  (Refer  to  TM 55-1520-228-23.) b(1).   Remove   and   inspect   the external   check   valve.   (Refer   to   para 5-29.) b(2).  Inspect  for  leakage  from  power turbine   carbon   face   seal. (1).   Clean   or   replace   the   internal check  valve.  (Refer  to  para  5-28.) (2).  Remove  filter  housing  and inspect   housing   and   transfer   tubes (2)   mating   surfaces.   Check preformed  packing  on  housing  end  of transfer   tubes.   Replace   defective items.  (Refer  to  para  5-27.) Replace   leaking   seal.   (Refer   to   para 7-27.) If  engine  will  rotate  after  cool-down, no   corrective   action   required.   If unable   to   rotate   engine   after   cool- down,  replace  engine.  (Refer  to  TM 55-1520-228-23.) Remove only one case half at a time. An   alignment   problem   will   b encountered   if   attempt   is   made   to assemble both case halves at the same time. a.  Binding  of  compressor. a(1).  Remove  one  compressor  case half   and   determine   if   compressor rub  is  occurring  because  of accumulated   dirt.   Clean   case   halves. (Refer  to  para  7-5.) a(2).  If  compressor  rub  is  caused  by debonded   plastic,   replace   compressor case  halves.  (Refer  to  para  8-2.) Change 14 4-12.1