Along the crankshaft you’ll find balancing lobes that act as counterweights to balance the crankshaft and prevent engine damage from the wobbling that occurs when the crankshaft spins. Also along the crankshaft you’ll find the main bearings. The main bearings provide a smooth surface between the crankshaft and engine block for the crankshaft to spin.
Rocker arms are little levers that touch the lobes, or cams, on the camshaft. When a lobe lifts one end of the rocker, the other end of the rocker presses down on the valve stem, opening the valve to let air in to the combustion chamber or letting exhaust out. It works sort of like a see-saw.
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