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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 b. Clean O-ring bore using 0-ring bore cleaning brush as follows. (1) Chuck bore cleaning brush in 1/2 inch drill.  Rotate brush and move in an up and down motion in 0-ring bore. (2) Thoroughly clean all corrosion and lime deposits from O-ring bore. c. Measure cylinder block as follows: (1) Measure main bearing bore diameter, refer to FIGURE 3-138.  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.  With 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 3-138.  Measuring Main Bearing Bore Diameter NOTE Replacement bearing caps are supplied with bearing bore unfinished. (4) Measure  cam  follower  bore  diameter,  refer  to  FIGURE  3-139.    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) 3-199


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