properly. The delivery valve holder must be assembled with a twelve point wrench, and retorqued to 70-80 ft-lbs dry. The cap nut must be retroqued to 55-60 ft-lbs dry. On ASK equipped generators, refer to Operator  and  Organizational  Maintenance  Manual  and  install  right panel and top panel assemblies. 7-19.  CYLINDER  BLOCK. (1)  Steam  clean  cylinder  block  to  remove  de- posits  of  oil  and  dirt.  Immerse  block  in  solvent  tank to clean out internal passages. (2)  Inspect  top  surface  of  cylinder  block,  the surface that mates with the cylinder head, for warping. Check both across cylinders and in line with cylinder. (3)  Use  magnetic  particle  method  to  check  the cylinder  block  for  cracks.  Replace  block  if  cracked. (4)  Cylinder  walls  should  be  free  of  scratches, pitting   and   scuffing.   Check   each   cylinder   with   an inside reading micrometer for out -of -round and wear. See Table 1-2 for bore measurements. b. Overhaul  and  Rebuild.  Always  de-glaze  cylinder walls.  If  necessary,  hone  or  rebore  the  cylinder  to fit   the   next   available   oversize   piston.   Pistons   and rings  are  available  in  0.005,  0.010,  0.020,  0.030  and 0.040   inch   oversize.   If   cylinders   do   not   need   re- finishing, remove any existing ridges from top of wall with a fine stone. c.  Install.  If  the  cylinder  block  requires  replace- ment a new set of injection pump shims must be used and  the  injection  pump  must  be  re-timed.  The  shims are   supplied   with   the   replacement   cylinder   block.   Refer to   paragraph   7-18   a.   (3)   for   calculation   of   shim thickness. 7-20. FUEL INJECTOR, All  injector  openings  and  injector  nozzles must  be  capped  when  the  injector  is  removed from the engine. a. Removal. On ASK equipped generators, refer to Operator and Organizational   Maintenance   Manual   and   remove   top   panel assembly. (1) Remove fuel lines (3 and 7, figure 7-1) at fuel injectors. (2)  Remove  screws  (1,  figure  7-45),  washers  (2) and retaining flanges (3). (3)  Remove  fuel  injector  (4),  gasket  (5),  adapter (6), gasket (7), heat shield (8) and gasket (9). Separate injector from other components. Do  not  attempt  to  disassemble  nozzles  or adjust  nozzle  pressure  without  the  proper  test equipment.  A  nozzle  pressure  tester  is  essen- tial to do this work. TM5-6115-585-34 NAVFAC  P-8-623-34 TO-35C2-3-455-2 TM-05684C/05685B-34 Do not allow nozzle to spray against skin. Fuel under  nozzle  pressure  can  penetrate  flesh  and cause a serious infection. b.  Test.  Install  nozzle  to  be  tested  on  a  static  fuel nozzle   testing   fixture.   Increase   fuel   pressure   until nozzle opens. Opening pressure should be 1950 ± 25 psi  for  a  new  nozzle  or  1750  ±  25  psi  for  a  used nozzle  (200  hours  or  more).  If  nozzle  opening  pres- sure is lower, adjust to 1950 psi for a new nozzle or 1750 psi for a used nozzle (see adjustment procedure). C. Adjust. (1) Remove pipe plug (1, figure 7-46). (2) Loosen (do not remove) cover (2). (3) Install injector nozzle on a static fuel nozzle testing  fixture. (4) Insert a 5/32 inch hex socket key through hole in cover (2). (5) Adjust opening pressure with hex key to cor- rect  pressure  (1750  Psi  for  a  used   injector,  1950   psi for  a  ‘new  injector). ^- (6) Tighten cover sure. d.   Disassemble. (2), and recheck opening pres- NOTE When   removing   and   disassembling   fuel   in- jectors, separate and label components of each injector. Never interchange components of in- jectors. Never  clamp  injector  in  a  vise  without  soft jaws. (1)  Secure  injector  in  a  holding  fixture  and  re- move nozzle cap nut (12, figure 7-46) and nozzle (9). NOTE Do  not  remove  nozzle  unless  replacement  is required. (2) Install  nozzle  cap  nut  (12)  loosely  to  protect lapped surfaces of injector body. e. Clean. Clean injectors in a clean room on a clean work bench. Provide a pan of clean diesel fuel and a supply  of  lint-free  wiping  cloths.  Never  use  hard  or Change 6 7-41