TM 5-3810-207-20/TO 36C23-3-37-12 Section VI.  CRANE ENGINE LUBRICATION SYSTEM 112.  General The  internal  parts  of  the  engine  are  pressure- lubricated.      The   oil   is   forced   by   a   pump   from   the crankcase  to  the  two  oil  filters,  through  the  oil  cooler, and back to the crankcase.  The oil filters are equipped with replaceable elements. 113.  Oil Filters a. Removal.  Remove the oil filter as instructed on figure 46. b. Cleaning.  Inspection, and Repair. (1) Clean all parts with an approved cleaning solvent. (2) Inspect  all  lines  and  fittings  for  damage. Replace defective lines and fittings. (3) Inspect the oil filter bodies and mountings for   dents,   breaks,   and   other   damage. Repair or replace all defective parts. (4) Replace filter elements and gaskets. c. Installation. (1) Install  the  oil  filter  as  illustrated  on  figure 46. (2) Service the oil filters (TM 5-3810207-10). 114.  Crankcase Filler and Breather a. Removal.      Remove   the   crankcase   filler   and breather as instructed on figure 46. b. Cleaning and Inspection. (1) Clean all parts with an approved cleaning solvent. (2) Inspect  all  parts  for  breaks,  cracks,  and other   damage.      Replace   all   defective parts. c. Installation.      Install   the   crankcase   filler   and breather as illustrated on figure 46. 115.  Pressure Relief Valve a. Removal.  Remove the pressure relief valve as illustrated on figure 47. b. Cleaning and Inspection. (1) Clean all parts with an approved cleaning solvent. (2) Inspect    all    parts    for    excessive    wear, breaks,  and  other  damage.    Replace  all defective parts. c. Adjustment.  Adjust the pressure relief valve by installing   the   correct   number   of   shims   in   plunger   to obtain    the    correct    spring    tension    to    regulate    the operating  oil  pressure  to  40-50  pounds.    Add  shims  to increase pressure; remove shims to decrease pressure. d. Installation.    Install  the  pressure  relief  valve  as illustrated on figure 47. 116.  Oil Cooler a. Removal. (1) Drain  the  lubricating  system  (TM  5-3810- 207-10). (2) Remove  the  oil  cooler  as  instructed  on figure 48. b. Cleaning and Inspection. (1) Clean all parts with an approved cleaning solvent. (2) Inspect   the   valve   for   proper   operation. Replace defective valve. (3) Inspect  the  oil  cooler  for  bent  fins,  holes, cracks,    and    other    damage.        Replace defective oil cooler. (4) Inspect     lines,     fittings,     and     mounting hardware   for   bends,   breaks,   and   other damage.  Replace defective lines, fittings, and mounting hardware. c. Installation. (1) Install the oil cooler as illustrated on figure 48. (2) Fill   the   lubricating   system   (LO   5-3810- 207-20). 76