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The crankshaft of a 37.5-hp, 3-cylinder oil engine was examined. The engine had been dismantled for the purpose of a general overhaul and in the course of this work the crankpins were chromium-plated before regrinding. The engine was returned to service and after running for 290 h the crankshaft broke at the junction of the No. 3 crankpin and the crankweb nearest to the flywheel. A typical fatigue crack had originated at a number of points in the root of the fillet to the web. In its early stages it ran slightly into the web but turned back to...

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