A valve basically controls the flow of air and fuel into the engine's cylinder, and then lets the exhaust gases out. There's an intake valve for bringing the mixture in, and an exhaust valve for letting the burnt stuff go. It opens and closes precisely timed with the engine's movements, using a camshaft and other parts to make it happen. Think of it like a little doorway that’s opening and closing really fast to let things in and out. These valves are absolutely critical to the whole combustion process. Without them, the engine just wouldn’t run. They’re part of the cylinder head, so they're right at the heart of things. They work with the pistons, the spark plugs… everything has to work together. If a valve isn't sealing properly, or isn’t opening and closing when it should, it throws everything off. Well, if a valve fails, you’ll notice it. You'll probably get a rough idle, loss of power, maybe even a misfire. It can lead to serious engine damage if you keep driving on a bad valve. It acts like a shield protecting the vital parts of the engine, so when that seal breaks, things can go wrong quickly. They wear out over time, like anything else, but a failing valve can cause bigger issues if you don’t get it sorted. You can often find replacements online—Fixparts Online has a good selection—and it’s usually worth doing the job properly to keep your engine running smoothly. Technical support you can rely on: Valve (MPN 038109601F) comes with a 12-month warranty!

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