To turn a linear motion into a rotary motion.
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To transfer the up and down movement of the pistons and connecting rods to rotation.
In middle of crankshaft pulley
You have rod bearing caps that hold the rods on the crankshaft. And you also have main bearing caps that hold the crankshaft in the engine block. NEUTZ.
The Crankshaft Position Sensor senses it's position from a toothed timing ring behind the Crankshaft pulley. The CKP is above and to the left of the crankshaft pulley.
An automotive engine's camshaft rotates at A. the same speed as the crankshaft. B. one-quarter the speed of the crankshaft. C. one-half the speed of the crankshaft. D. twice the speed of the crankshaft.
Main bearings are between crankshaft and main journals (engine block), rod bearings are between connecting rods and crankshaft and thrust bearings ensure crankshaft does not slide horizantally between journals they hold crank in place.