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ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 5-63 (c) Inspect crankshaft for any signs of load stress, cracks, scoring, or scratches on journals.   (An inspection must be made if the crankshaft damper was found to be damaged or defective.)  Figure 5-68 shows critical areas of load stress in a crankshaft. FIGURE 5-68.  CRITICAL AREAS OF CRANKSHAFT LOAD STRESS NOTE When inspecting crankshaft for cracks, a method (such as the Fluorescent Magnetic Particle Method) must be used that is capable of detecting minute cracks that are not visible to the eye.  This method magnetizes the crank, employing magnetic particles which are fluorescent and glow under black light.  Replace crankshaft if cracks are found.  The crankshaft must be demagnetized after the test. (d) Check each journal for evidence of excessive overheating or discoloration.  If either condition exists, replace crankshaft since heat treatment has probably been destroyed. (2) Measure assembled inner diameter of bearings and outer diameter of crankshaft journals as follows: (a) With crankshaft out of engine block, install main bearing inserts and caps (be sure inserts are installed correctly). (b) Tighten main bearing capscrews.  Refer to Table 5-5 for values. (c) Measure inner diameter of all bearings with an inside micrometer.  Refer to Table 5-5 for values.


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