TM 10-3930-671-24 2. Install  precombustion  chamber  inserts,  making sure  they  are  fully  seated.    Insert  projection  in reference  with  cylinder  head  surface  is  flush  to .003" (0.076 mm) projection. 3. Use new cylinder head gasket, which is precoated, thus no cement is required. 4. Using   a   chain   hoist,   lower   the   cylinder   head assembly evenly over the locator stud.  Replace the  locator  stud  with  the  proper  cylinder  head cap screw. 5. Before   installing   any   head   cap   screws   in   the block,  be  sure  the  threads  in  the  block  and  on the   cap   screws   have   been   properly   cleaned. Should   these   tapped   holes   need   cleaning   or reconditioning,  care  should  be  taken  to  use  the proper tap. Tap: M 10 x 1.5 CLASS 6G M 12 x 1.54 CLASS 6G  6. 6. The cylinder head cap screws require no sealant but should be installed with a very light coating of  engine  oil  or  lubriplate  to  reduce  friction  and insure  proper  clamp  load  and  head  cap  screw torque. Tighten with torque wrench in recommended   sequence   to   the   correct   torque shown  in  torque  chart  in  Section  10,  by  going over them two times before pulling them down to the final torque specifications on the third round. 7. Install the injectors  and  glow  plugs  at  this  point. Having   the   injectors   and   glow   plugs   in   now eliminates   the   risk   of   dirt   and   foreign   objects falling into the cylinder. NOTE Always   use   new   steel   heat   should washers  when  installing  injectors  in cylinder head. F-187