b. Cleaning.    Refer  to  paragraph  6-3.a  for  general clean-ing instructions. (1) Clean fuel filter (2) using ultrasonic cleaner (Table 2-1). c. Inspection.  Refer to paragraph 6-3.b for general in-spection instructions. (1) Replace    diaphragm    (1)    if    deformed    or cracked.      (2)   Replace   filter   (2)   if   rim   or screen is cracked or broken. d. Repair  or  Replacement.    Refer  to  paragraph  6- 3.c for general repair or replacement instructions. (1) Replace a deformed or cracked diaphragm (1). (2) Replace   fuel   filter   (2)   if   rim   or   screen   is cracked or broken. e. Assembly.      To   assemble   the   fuel   feed   pump assem-bly, proceed as follows: (1) Position fuel filter (2) on pump base.  Place gasket  (3)   in   top   cover,   and   position   top cover  on  base  over  fuel  filter  (2).    Attach cover to base using gasket and screw (4). (2) Insert  diaphragm  (1)  into  lower  body  and join  both  halves  of  the  pump  body  using washer and screws (5). 6-38.    Fuel  Injection  Pump  Assembly  (Figure  8-35).    If fuel   injection   pump   requires   rework   or   repair,   replace injection pump and send pump to be repaired to a Bosch Repair   Center   or   equivalent.      Time   engine   with   new pump in accordance with DIESEL ENGINE ASSEMBLY, (Sec.  VI, paragraph 6-33, e). 6-39.    Fuel  Injector  Assembly  (See  Figure  8-36).    The following    paragraphs    contain    disassembly,    cleaning, inspection, repair or replacement and assembly instructions for the fuel injector assembly. a. Disassembly.      Only   when   test   results   are   not within limits should the fuel injector assembly be disassembled. Disassemble the injector assembly only to the extent neces-sary to repair or replace a defective part or parts. CAUTION Under no circumstances should the nozzle, valves.  and discs be interchanged. To avoid interchanging, disassemble and reassemble one injector at a time. CAUTION Disassemble the fuel injector in a clean, well-lighted work area isolated from the rest of the shop. (1) Separate retainer nut (1) from nozzle holder (7). (2) Remove   shim/s   (2),   pressure   spring   (3), and  pressure  spindle  (4)  from  intermediate disc (5). (3) Separate disc (5) and nozzle (6). b. Cleaning.    Refer  to  paragraph  6-3.a  for  general clean-ing instructions. NOTE Do  not  allow  parts  to  remain  in  dry  cleaning  solvent  for extended periods of time or rust spots may form.  If parts are  not  to  be  inspected  immediately  after  cleaning,  dip them in engine oil per Military Specification MIL-- 2104 or equivalent. (1) All     components     shall     be     cleaned     and washed  out  thoroughly  in  solvent.    Federal Specification P-D-680, Type II. (2) Dry parts with low pressure compressed air (30 psig maximum). NOTE Do  not  be  too  hasty  in  judging  the  perform-ance  of  a nozzle.    It  has  been  found  that  after  soaking  nozzles  in solvent  for  a  day,  that  many  will  meet  specifications  for leakage   or   opening   pressure   that   might   otherwise   be rejected. (3) After  the  nozzle  (6)  has  soaked  in  solvent, use   a   brass   wire   brush   to   remove   any remaining carbon or fuel stains from the tip. See Figure 6-21. (4) Clean  the  orifice  holes  in  the  nozzle  valve body  tip.    Use  a  cleaning  wire  protruding only  1/16  inch  (1.5875  mm)  out  of  the  pin vise for best 6-59