If it becomes loose, you may notice a rattling noise underneath the hood as the valve train tries to work with an ill-fitting belt. The other possibility is that your belt becomes loose because of wear, stretching, or damage from a foreign object. They'll turn the key, and nothing will happen because there's no engine compression. This can happen if someone starts the car when the belt has just broken. If the belt breaks, you won't be able to start your vehicle for a similar reason – there won't be an effective vacuum in the intake manifold, and no air will reach the cylinders. In effect, the valves will repeatedly be slamming into the pistons, and they'll never move again. This is caused when the engine rotational speed becomes too slow to turn the valves off in time with the pistons. If the teeth on the camshaft or crankshaft slip, you won't be able to change gears. If your timing belt goes out, it can happen in several ways. What happens when your timing belt goes out? If this belt fails, the pistons and valves will become misaligned, and your engine won't work. It pushes on a tensioner pulley and keeps engine valves in time with piston movement. The timing belt – which is just a rubber reinforced cog belt – is driven by the crankshaft. The timing belt also sends oil from an oil sump up to lubricate gears in the engine block, especially the camshaft. In a four-stroke, four-cylinder engine, this happens every two revolutions of the crankshaft. What is a timing belt, and what does it do?Ī timing belt is a belt that keeps the camshaft and crankshaft spinning together.
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