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TM5-4210-229-14&P 6-13.  FLYWHEEL, CRANKSHAFT, AND MAIN BEARING MAINTENANCE (Continued). (3) Mill or grind surface of the NEW cap to dimension plus 0.002 in (0.05 mm). NOTE 0.002 in (0.05 mm) is added to dimension to allow enough stock for a finish cut on surface after the cap and bearing have been fitted to the crankcase. The bearing cap must be located on its machined side when grinding surface to hold squareness. (4) Clamp the OLD bearing cap to a surface plate. (5) Place a drill rod of any size from 1/4 to 1/2 inch (6 to 13 mm) on the inside of the cap (against notched side).  Measure this dis- tance with a micrometer and record the reading. (6) Measure the diameter of the drill rod shank and add this reading to the reading taken in step (5) above.  This will be dimension A. (7) Measure dimension A of the NEW bearing cap in the same manner as described in steps (3), (5), and (6) above. (8) Subtract dimension A of the OLD cap from dimension A of the NEW cap and record the difference.  Mill or grind this amount from surface C of the new cap.  Dimension A of both caps will now be equal. NOTE Surface C must be held square with surface D and parallel to the bearing bore. (9) Mill or grind surface B of the new cap until the dimension E 6.050-6.052 in.  (153.67- 153.72 mm) shown from surface C to B is obtained. NOTE Surface B must be held square with surface D and parallel to the bearing bore. c.  Main bearings installation. (1) Install a new bearing in a new bearing cap or the original bearing in the original bearing cap, as called for. (2) Bearing clearance check. NOTE Do not turn the crankshaft during this procedure. (a) Clean the bearing surface and the ex- posed half of the crankshaft journal.  Be sure these surfaces are free of oil. (b) Place a suitable length of 0.010 inch (0.254 mm) virgin lead wire or a piece of plastigage (Appendix D, Item 40a) across the bearing surface. (c) Install the bearing cap and torque the cap screws to 115 ft-lb (155 N.m). (d) Remove the bearing cap.  When virgin lead is used, measure the crushed thickness with a micrometer and re- cord the results.  When plastigage is used, the flattened plastic material will be found adhering to either the bearing or the crankshaft.  Do not remove the plastigage.  Determine bearing clear- ance by comparing the width of the flat- tened plastic with the graduations on the envelope. 6-40

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