Slowly  pump  pressure  up  to  2,  300 psig (15, 858 KPa)  and  maintain  this pressure for ten seconds.  Wetting of the  nozzle  is  permissible  without  the formation of a droplet. (g) Bleed off pressure and remove injector from test line. (h) If  injector  failed  to  meet  any  of  the preceeding test results, refer to FUEL IN-JECTOR ASSEMBLY (Section VI) and repair injector. 6-40.      Fuel   Filter   Assembly   (See   Figure   8-37).      The follow-ing   paragraphs   contain   disassembly,   cleaning, inspection, repair or replacement, and assembly instructions for the fuel filter assembly. a. Disassembly.          Disassemble     the     fuel     filter assembly   only   to   the   extent   necessary   to   repair   or replace a defective part or parts. (1) Unscrew and remove screw (1) and gasket (2).      Separate  filter  housing  (3)  from  filter flange (10). (2) Using o-ring, remove filter element (4) from housing (3). (3) Remove  o-ring  (5)  from   recess   in   flange (10). (4) Unscrew    and    remove    bleed    valve    (6), gasket  (7),  pipe  plug  (8),  and  gasket  (9) from flange (10). b. Cleaning.    Refer  to  paragraph  6-3.a  for  general clean-ing instructions. c. Inspection.  Refer to paragraph 6-3.b for general in-spection instructions. (1) O-ring for deformation, cuts, or nicks. (2) Housing for dents. (3) Flange for cracks or breaks. (4) Threaded parts (fittings, etc.) for stripped or damaged threads. d. Repair  or  Replacement.    Refer  to  paragraph  6- 3.c for general repair or replacement instructions. e. Assembly.  To assemble the fuel filter assembly proceed as follows: (1) Assemble  gasket  (9),  pipe  plug  (8),  gasket (7), and bleed valve (6) to filter flange (10). (2) Coat  o-ring  (5)  with  engine  fuel.    Press  o- ring (5) into recess in flange (10). (3) Wipe  contact  surfaces  of  filter  element  (4) with  engine  fuel.    Install  element  (4)  over stem in filter housing (3) with o-ring in down position. (4) Using   copper   gasket   (2)   and   screw   (1) attach   housing   (3)   with   element   (4)   to flange (10). 6-41.    Frame  Group  (See  Figure  8-38).    The  following para-graphs  contain  disassembly,  cleaning,  inspection, repair or replacement, and assembly instructions for the frame group. a. Disassembly.  Disassemble the frame group only to  the  extent  necessary  to  repair  or  replace  a  defective part or parts. (1) If  battery  cables  have  not  been  removed from battery (3) remove cables. (2) Unscrew  and  remove  wing  nuts  (1)  from battery  tie  down.    Remove  battery  retainer (2) and lift battery (3) from frame.  Remove battery-support   (4)   and   J-bolts   (5)   from engine supports (9). (3) Unscrew  nuts  (6),  washers  (7)  and  screws (8)   from   engine   supports   (9).      Remove engine sup-ports (9) from skid (17). (4) Unscrew  and  remove   nuts   (10),   washers (11), straps (12) and webbing (13) from fuel tank (14).  Remove fuel tank (14) from skid (17).    If  fuel  tank  is  to  be  cleaned,  remove plug (15) and cap (16) from fuel tank (14). b. Cleaning.    Refer  to  paragraph  6-3.a  for  general clean-ing instructions. c. Inspection.  Refer to paragraph 6-3.b for general in-spection instructions. (1) Check welds for cracks or tears. (2) Check  fuel  tank  for  seam  tears  or  cracks. 6-63