Quantcast FIGURE  3-87.  Crankshaft  Journal  and  Crankpin  Diameter

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ARMY  TM  42815-254-24 AIR FORCE TO 38G1-94-2 N O T E If bearing gage (PLASTIGAGEPR1) method of checking clearance is used, omit steps e, f, and g. e. Check crankshaft journal and crankpin diameter as follows: (1) Using a micrometer, measure crankshaft journal diameter at two places, 180 degrees apart and at two points along its length, refer to FIGURE 3-87. (2) Repeat step (1) for crankpin. (3) Standard diameter for crankshaft journal is 2.7548 to 2.7533 in. (69.920 to 69.632 mm), with a limit of 2.7560 in. (69.95 mm). Standard diameter for crankpin is 2.0849 to 2.0854 in. (52.918 to 52.930 mm), with a limit of 2.0862 in. (52.95 mm). Uneven wear standard value is 0.00004 in. (0.001 mm), with a limit of 0.002 in. (0.05 mm). (4) If measured values are less than limits, crankshaft must be replaced or reground. FIGURE  3-87.  Crankshaft  Journal  and  Crankpin  Diameter f. Check crankshaft journal and bearing clearance as follows: (1)   Install main bearings and bearing caps. Tighten bearing cap bolts to 123 ft-lbs (166.8 Nm). 3-137


 


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