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diminished horespower in rebuilds
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[quote]QUOTE: <i>Originally posted by Overmod</i> <br /><br />Weirdly enough, I would NOT have expected most of the crank breaks to be at the flywheel end. I'd have thought somewhere in between pairs of cylinders inducing the greatest mutual torsion... not working against flywheel inertia. I learn something every day from Randy... <br /> <br />Where were most of the breaks on the 16-cylinder 244s? (I've always wanted to know that!) <br /> <br />This isn't directly germane to *locomotive* crank breaks, but IIRC the breakage of GM truck diesel cranks is often somewhere other than at the rear main bearing. I read an account of one person with a 6.5TD who had a broken crank between the first and second pairs of cylinders. His complaint was that the engine ran a bit rough, and only seemed to make about 75% power... he was so right! Only the rear six cylinders were actually providing effective torque; the two in the front were mainly driving the auxiliaries; there was just enough interference between the two broken halves that they stayed in rough sync (think about how the injection pump wandered in and out of 'time' though, depending upon effective torsion... !) <br />[/quote] <br /> <br />Alco's 244 engine was rushed to market at the end of wwII because Alco was not allowed to produce a competitive road locomotive until restrictions of the war production board were lifted. It took them a while to establi***he criteria for a reliable crankshaft and also find a supplier that could consistently produce it. Other design problems in the 244 contributed to crankshaft failures, mainly the interface between the main bearing saddles and their respective caps were not designed properly, causing misalignment with wear, and thermal cycling of the block also causing misalignment problems from distortion of the block itself over time. <br /> <br />I do not know what that would mean as far as any trend towards the most common location of failures in a 244 crank, but can say that a failure caused by stress from misalignment would most definately be accompanied by unusual wear in adjacent journal bearings.
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