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TM-9-2815-254-24 Diesel Engine Model DN4M 4 Cylinder 1.2 Liter Manual
Remove  dowel  pins  and  fittings  only  if  necessary. 3-32.2.    lnspection/Repair. NOTE Letters and numbers are stamped on top face of block at each cylinder bore. Letters  (A  or  C)  represent  grade  of  piston  installed  during production. Numbers (1, 2, 3, or 4) represent grade of cylinder liner installed  during  production.  However.  when  ordering  a  new  cylinder  liner for service repair either a No. 2 or No. 3 grade cylinder liner will be supplied. Either one may be used to replace whatever grade liner was used  in  production. a. Check  cylinder  block  upper  face  warpage  as  follows. (1) (2) (3) (4) If  not  removed,  remove  dowel  pin. Remove  cylinder  liner,  refer  to  paragraph  3-32.1  step  h. Using  a  straight  edge  and  a  feeler  gage,  measure  the  four  sides  and  two  diagonals  of  cylinder block  upper  face,  refer  to  FIGURE  3-112. Standard  warpage  is  0.002  in.  (0.05  mm)  or  less.  If  measured  value  exceeds  0.008  in.  (0.2 mm)  but  is  less  than  0.016  in.  (0.4  mm),  regrind  the  cylinder  block.  If  measured  value  is greater  than  0.006  in.  (0.14  mm),  replace  cylinder  block. Change  2 3-165
ARMY  TM  9-2815-254-24 AIR FORCE TO 38G1-94-2 FIGURE  3-111.  Cylinder  Block  Assembly 3-164  Change  2


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