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TM   9-2815-202-34 4-36.   CYLINDER   BLOCK   MAINTENANCE   (Cont) (2) Check  cylinder  block  bores  as  follows: (a) After honing, check for low spots in cylinder bore. There must not be any low spots larger than one inch  in  diameter. (b) Measure entire bore of each cylinder with a cylinder bore gage (62).  Take  measurements  on cleaned-up surface only at positions A, B, C, D, E, and F in bore  on  axes  45  degrees  apart. Block bore I.D. is classified as #0, #1, #2, #3, or #4 (see Para 4-34). NOTE Diameter  of  standard  block  bore  is  4.6256  to  4.6275  inches.  Maximum  liner  to  block clearance is 0.0025 inch with used parts and is 0.0015 inch with new parts. (c) "A" Diameter - Must be same size as “B” diameter within +0.0006 inch and never smaller (no  bottleneck  allowed). (d) "B" Diameter - Is classification area  for determining whether a cylinder bore is a #0, #1, #2, or #3 size. "B" has a 0.0019 inch tolerance band. (e) "C" Diameter - Should be same size as "B" diameter. However, due to a bell mouth flare caused  by  honing  stones  traveling  through  air  box  area,  a  maximum  +0.0022  inch diameter flare over  "B" diameter  is  allowed. 4-168 C  h  a  n  g  e      1


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