Quantcast FIGURE 3-157.  Measuring Main Bearing Bore bitter

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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 (2) Thoroughly clean all corrosion and lime deposits from  -ring bore. c. Measure cylinder block as follows: (1) Measure main bearing bore diameter, refer to FIGURE 3-157.  Main bearing bore diameter must be 3.325 to 3.326 inches (84.46 to 84.48 mm). (2) Measure engine block main thrust bearing width.  Width must be 1.3235 to 1.3275 inches (33.62 to 33.72 mm) (3) If bearing caps are damaged, or bore is not within specification, replace cylinder block. FIGURE 3-157.  Measuring Main Bearing Bore bitter NOTE Replacement bearing caps are supplied with bearing bore unfinished. (4) Measure  cam  follower  bore  diameter,  refer  to  FIGURE  3-158.    New  diameter  is  1.248  to  1.250  inches (31.70 to 31.75 mm).  If diameter is more than specified, install a new engine block.  Service bushings are not available.  New cam follower diameter is 1.245 to 1.246 inches (31.62 to 31.65 mm).  Maximum cam follower clearance is 0.005 inch (0.13 mm) FIGURE 3-158.  Measuring Cam Follower Bore Diameter (5) Measure camshaft bore diameter, refer to FIGURE 3-159.  Mew diameter is 2.204 to 2.2-5 inches (55.98 to 56.01  mm).    If  diameter  is  more  than  specified,  install  a  new  engine  block.    New  camshaft  journal clearance  (camshaft  bore  ID  minus  camshaft  journal  OD  is  0.003  to  0.005  inch  (0.08  to  0.13  mm). Maximum clearance is 0.006 inch (0.15 mm). 3-206


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