TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 NOTE To   prevent   hardening   and   drying   of foreign substances, clean cooler assembly  immediately  after  removing end cover plates. Use approved cleaning   solvent   that   will   not   harm non-ferrous metal.  Finish cleaning by blowing through core with compressed air. (2)   Repair  damaged  tubes,  by  inserting  a  smaller OD  tube  inside  damaged  tube.    Cut  and  flare ends, then solder securely.  Do not restrict more than  5  percent  of  total  number  of  tubes  in  this manner.    If  more  than  5  percent  of  tubes  are defective, discard cooler. (3)   To  assemble  the  lubricating  oil  cooler,  install new gasket (38), cover (36), new washers (27), new  gasket  (38),  new  gasket  (29),  connection (28), and new screws (25), (26) and (33). c. Bypass Oil Filters.  The bypass oil filters are located on    a    bracket    mounted    over    the    starter    motor assembly  on  the  right  side  of  the  engine.    Service the bypass oil filters by replacement as follows: (1)   Clean  filter  case.    Handle  or  store  in  a  manner to prevent out-of-round. (2)   Insert   new   element   in   filter   case,   seating   it securely on bottom. (3)   Fill element with proper lubricating oil.  Refer to table   3-1   of   the   Operator/   Crew   and   Organizational Maintenance manual. (4)   Install  new  top  gasket,  position  filter  case,  and tighten clamps securely. (5)   Run engine, check for leaks, recheck engine oil level;  add  oil  as  necessary  to  bring  oil  level  to  FULL mark on oil level gauge (dipstick). NOTE Always  allow  oil  to  drain  back  to  oil pan  before  checking  level.  This  may require several minutes. 13-12.  BYPASS VALVE.  To inspect, test, replace, and repair the lubricating oil filter bypass (relief) valve, refer to figure 13-14, and proceed as follows: a. Removal. (1)   Drain  the  engine  oil  and  remove  the  oil  filters (13)  in  accordance  with  the  Operator/Crew  and Organizational Maintenance manual. (2)   Remove oil transfer tube (3) and discard O-ring (4). (3)   Remove capscrews (1) and washers (2). (4)   Remove   capscrews   (5),   capscrews   (6),   and washers (7); discard gasket (11). LEGEND FOR FIGURE 13-14 1. Screw 12. Lubricating oil 22. Lockwasher 32. Lubricating oil 2. Washer filter assy 23. Head cooler assy 3. Tube 13. Filter 24. Gasket 33. Screw 4. O-ring 14. Adapter 25. Screw 34. Screw 5. Screw 15. Lockplate 26. Screw 35. Lockwasher 6. Screw 16. Plug 27. Lockwasher 36. Cover 7. Lockwasher 17. Plug 28. Connection 37. Cover 8. Tube 18. Retainer 29. Gasket 38. Gasket 9. O-ring 19. Spring 30. Tube 39. Cooler 10. Connection 20. Disc. 31. O-ring 40. Screw 11. Gasket 21. Screw 41. Bracket 13-27