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A timing belt is a flexible, toothed belt that connects the crankshaft to the camshaft in an engine. It is designed to maintain the precise alignment of these components, allowing the engine to operate smoothly and efficiently. Unlike timing chains, which are made of metal, timing belts are typically made of reinforced rubber, making them lighter and quieter. However, this material also means they are subject to wear and tear over time, which can lead to serious engine problems if not addressed.


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The timing belt is a crucial part of an internal combustion engine. Typically made from a reinforced rubber compound, it features teeth along its inner side, which interlock with gears on the crankshaft and camshaft. This precise synchronization is vital for the engine's performance because it ensures that the engine valves operate in harmony with the pistons, preventing interference. In interference engines, a timing belt failure can lead to a catastrophic collision between the pistons and valves, causing significant wear and potentially complete engine failure.


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