At   times,   inclement   weather   has   caused   difficulties. This   is   especially   true   in   an   unprotected   harbor   where the  water  roughness  or  groundswells  have  had  an  effect on  the  movement  of  the  ship  at  the  pier.  Therefore,  to facilitate   the   changeout,   the   ship   must   be   pierside   and should   be   inboard   of   any   other   ship(s)   present. Sometimes,   floating   cranes   have   been   used,   but   the evolution   was   still   hampered   by   the   elements. Tenderside   Changeouts Tenderside  changeouts  have  problems  of  a  different nature.  The  tender  is  a  stationary  platform.  The  ship must  be  moved  and  positioned  around  the  tender  to  help the   crane   service.   The   SSE   containers,   when   stored   on the  tender  and  within  reach  of  the  crane,  were  on  the  03 or  04  level.  This  made  travel  to  and  from  the  containers very   difficult. Horizontal  Rail  Systems The  horizontal  rail  systems  also  have  had  problems. Some   of   these   problems   are   attributed   to   a   lack   of inspection   before   use. —  To  ensure  safe  and  proper  handling  of  the  engine and/or  components  by  the  crane  operator,  have  the  ship ballasted   to   remove   any   listing. —Dry   trunnion   bearings   on   rail   stanchions   are difficult  to  turn.  This  is  especially  true  if  the  adjustment ring   holes   have   been   elongated.   Therefore,   a   grease lubricant   (MLG-G-10924   or   equivalent)   should   be   used to   lubricate   the   adjustment   ring. —The   horizontal   rail   flanges,   when   not   properly lined   up,   will   make   the   gas   generator   separation hazardous.  Misaligned  rail  flanges  may  cause  the  gas generator   position   to   shift   and   possibly   damage   the C-sump  air  seals.  On  mating  up  gas  generator  to  power turbine,  the  No.  6  bearing  cage  can  be  damaged  when the   front-frame   lift   fixture   roller   crosses   the   forward flange  in  the  rail.  This  makes  the  gas  generator  shift weight. —The  adjustable  rollers  on  the  lift  fixtures  are susceptible  to  corrosion.  Corrosion  may  cause  the  roller to   jam   into   one   position. If   not   properly   lubricated before  use,  the  adjustable  rollers  on  the  lift  fixtures  are capable   of   freezing   up.   This   makes   it   impossible   to center   the   engine. —When   not   properly   serviced   and   filled   with cylinder  oil,  the  hydraulic  support  mechanism  for  the compressor   front   frame   will   not   permit   the   jack   to   be extended   far   enough   to   support   the   front   frame   for removal  of  the  support  pins. —Ensure  all  feeder  rail  sections  are  installed  and aligned  before  checking  the  travel  of  the  system  with  a hand-held    roller. —If   a   bearing   failure   necessitates   an   engine changeout,  a  complete  flushing  of  the  lube  oil  system  is required. Tag  and  Bagging  Practices There  is  evidence  that  tagging  and  bagging  practices on  engine  changeouts  have  not  been  followed  to  the letter.  This  costs  time  during  reassembly.  Proper identification  is  a  valuable  asset  when  the  new  engine  is reassembled   in   place.   Lost   and   broken   bolts,   in   some cases,   do   not   exist   as   onboard   spares.   Therefore,   you need  to  exercise  care  in  disassembling  and  handling. Once  bags  have  been  filled  and  identified,  place  them  in a  secure  place  until  they  are  required  for  the  reassembly. Replacement   Engines Replacement  engines,  when  received,  may  not  be complete  with  all  the  fittings  and  adapters  necessary  for connection.  In  some  cases,  a  replaced  engine  was  in  the container  and  heading  for  the  supply  depot  before  this discovery  was  made.  This  caused  additional  time  to  be wasted  reopening  the  container  and  resealing  it  after  the parts   or   items   were   removed.   Time   has   also   been   lost when  the  replacement  engine’s  turbine  midframe  flange was   improperly   clocked   and   another   engine   had   to   be brought  to  the  changeout  site. Silencers Mark   the   location   of   the   silencer   hold-down brackets   before   removal.   Proper   marking   makes   it much  easier  to  reinstall  the  brackets  and  silencers. Quality  Assurance Review  QA  requirements  of  Combined   Forces Afloat   Quality   Assurance   Manual,   COMNAVSUR- FLANTINST   5090.lA   and   COMNAVSURFPACINST 4855.22,  for  level  A  repairs. GTG   ENGINE   CHANGEOUT GTG  engine  changeout  procedures  are  described  in detail  in  the  technical  manuals,  Model  104  Gas  Turbine Generator   Set,   volume  2,  and  Model   139   Gas   Turbine 2-31