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diminished horespower in rebuilds
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I know on Detroits, the air box covers have pockets cast into them. Because Detroits recieve their air from the V, broken rings, metal shavings, whatever is loose in the cylinder flies right into those pockets. Is this the case with EMD's? <br /> <br />What Randy says about where cranks break makes sense, when a crank "winds up", the greatest stress should be at the flywheel end. Usually what causes a crank to fail is fatigue from tortional vibration. Tiny cracks form in the filets around the oil holes and the filets between the journals and crank lobes. If two cracks meet, the failure begines a greatly accelerated pace. <br /> <br />If the crank fails elswhere it is probably due to some extreme shock like a siezed piston, hydraulic lock, or an imperfection - an Inclusion - in the metal. These types of failure are immediately recognizable by the crystaline structure of the fracture. <br /> <br /> A failure by fatigue over a long period of time will show a very small definate starting point with circles of increasing radius growing from that point - "beach marks", the fracture as a whole will have a smooth appearence, usually the last part of a fatigue fracture will be crystaline as the remaining material is no longer strong enough for a typical load. <br /> <br />Oh, I just have to add, RANDY IS THE MAN!!!!! - most of what we say is speculation, leave it to Randy to say say something that puts it all to rest !![8D]
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