TM 55-2840-241-23 (3)  Connect  the  electrical  lead  to  the  chip  detect- or  and  ground  the  case  of  the  chip  detector  to  the engine. (4) Using a screwdriver, short across the gap between the pole piece and the magnet and observe ENC.  CHIP  DET  indicator  light.  If  light  is  on,  circuit and detector test good. (5) If ENC. CHIP DET indicator light does not illuminate, check that case is grounded to engine. If light  is  still  not  observed,  remove  electrical  connector from chip detector and ground connector to engine. ENC. CHIP DET indicator light should illuminate. If light  does  illuminate  replace  chip  detector;  if  light  does not   illuminate,   check   circuits   for   continuity   and replace  defective  parts. (6)  Reinstall  chip  detector. (7)  Reinstall  electrical  connector  to  chip  detec- tor. (8)  With  engine  running,  check  the  magnetic chip detector light; the light should be out. 5-25  Oil  Filter. a.  Removal. (1) Remove the nuts (1, figure 5-11) and washers (2).  Remove  cap  (3)  with  preformed  packing  (4)  from housing (9) located on top of engine. (2)  Use  a  clean  suction  gun  or  another  suitable device to remove the puddled oil from within the filter housing (9) before removing the filter element (5). Do not damage the filter element. Examine sediment for evidence  of  metal  particles. (3)  Remove  the  filter  element  (5)  and  pre- formed packing (6). Discard the preformed packing. (4) Install the cap (3) with preformed packing on  housing  to  prevent  dirt  from  entering  the  housing. b. Cleaning. NOTE •  Use  ultrasonic  cleaning  equipment  if  avail- able. • Some engine bearings have silver-plated sepa- rators,  If  minute  silver  particles  are  found  in the  engine  oil  filter,  clean  and  reinstall  the filter.  Minute  silver  particles  are  due  to  normal bearing wear and are not cause for corrective action. (1)  Agitate  filter  element  in  solvent  (item  3, table 2-2) until clean. (2) Air dry filter element. (3)  Thoroughly  clean  the  oil  filter  cavity  of  all residual  oil  and/or  sludge  prior  to  the  installation  of  a cleaned  or  new  filter  element.  If  metal  particles  are present remove and examine magnetic plugs in gear case. c.  Installation. (1)  Remove  cap  (3,  figure  5-11  )  with  preformed packing  from  housing.  Discard  preformed  packing. Clean cap with a clean lint-free cloth. Install new pre- formed  packing  (4)  lubricated  with  engine  oil  (item  7  or 8, table 2-2) on filter cap. (2)   Install   new   preformed   packing   (6)   and cleaned filter element (5) in filter housing (9). (3)  Install  filter  cap  (3). (4) Tighten nuts (1) which secure filter cap to housing to 40-45 in. lb. d.   Testing.    After   the   filter   element   has   been cleaned or replaced, run the engine for a short duration and  check  the  splitline  for  leaks. 5-26.  Oil  Pressure  Regulator. NOTE Do not remove the pressure regulator unless the oil pressure cannot be adjusted within limits. a. Removal. Remove lockwire and turn guide (14, figure 5-11) out of housing (9). Remove spring (17) and poppet  (18)  from  the  housing.  Discard  preformed  pack- ing (16). b.  Installation. (1) Lubricate preformed packing (16) with oil (item 7 or 8, table 2-2) and place on guide (14). (2) Install poppet (18), spring (17), and guide (14) in housing (9). Turn the guide in until it bottoms; then back it out 5 ½ turns. (3) Adjust the regulating valve as outlined in step e. c.  Inspection. (1)  Check  the  external  condition  of  the  reg- ulator; ensure that the regulator is lockwired. If the regulator  is  not  lockwired,  check  the  adjustment  as outlined in step e. (2)  If  oil  pressure  cannot  be  adjusted  within limits, remove the regulator. Check for a broken spring (17) or evidence of poppet (18) sticking. Check for damage or wear on the poppet seating surface. d.  Testing. NOTE Oil  pressure  limits  apply  to  an  engine  that  is  at normal  operating  temperature. (1) With  the  engine  running  at  ground  idle, check  that  the  oil  pressure  is  50  psig  minimum. (2)  With  the  engine  operating  at  maximum speed,  check  that  the  oil  pressure  is  within  limits. (Refer to table 10-1.) e.    Adjustment. NOTE Any  adjustment  made  to  the  oil  pressure  reg- ulator should be verified by a calibrated  direct- reading  pressure  gage  connected  at  the  oil  pres- sure sensing port on the front of the gearbox. 5-18 Change 14