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A camshaft is the element of an internal combustion engine the purpose of which is to open and close the valves.orking in conjunction with the crankshaft, the camshaft rotates at half the speed of the crankshaft in a 4-stroke engine cycle and at the same speed in a 2-stroke engine.
The timing belt keeps the camshaft and crankshaft turning at the correct rate. The crankshaft moves pistons up for compression and exhaust cycles, while the pistons move down for power and intake cycles. Depending on the vehicle make, a timing belt will also run the water pump, oil pump and injection pump.