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Old 11-22-2012, 10:00 AM   #18
JCH841
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First of all, it is possible to overtighten anything; that's why they make torque wrenches. Likely not the problem here, but we had a crankshaft failure in a 6000 hp diesel because the factory (over) tightened the connecting rod bolts to the same torque as the main bearing caps and distorted the bearing caps. Most threaded fasteners will develop some adhesion in service; rust, corrosion, heat cycling such that the disassembly torque is likely higher than the assembly torque. In this case if there are any residual stresses or minute fractures from manufacturing/rolling threads, gross overtightening could precipitate a fracture failure.
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