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From Longman Dictionary of Contemporary English
Related topics: Motor vehicles
crankshaftcrank‧shaft /ˈkræŋkʃɑːft $ -ʃæft/ noun [countable]  TTCa long piece of metal in a vehicle that is connected to the engine and helps to turn the wheels
Examples from the Corpus
crankshaftAll moving parts, apart from the plain-bearing crankshaft, use needle roller bearings to help it rev freely.The Corrado's supercharger sits alongside the transversely mounted engine and is belt-driven off the crankshaft pulley at 1.66 times engine speed.Until six weeks ago I had first class service, then, suddenly, the crankshaft snapped.When checked for straightness, this crankshaft was found to have little or no distortion.
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