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exhaust valve - a valve through which burned gases from a cylinder escape into the exhaust manifold. exhaust system, exhaust - system consisting of the parts of an engine through which burned gases or steam are discharged. valve - control consisting of a mechanical device for controlling the flow of a fluid.
The exhaust system itself has many parts, some are very complex. The manifold is simple in design and function. They connect to the cylinder head and funnel hot exhaust fumes into one simple exhaust pipe. An exhaust leak can be due to a blown exhaust gasket, which is a relatively inexpensive fix, if caught soon enough. Leaks can also come from cracks in the manifold itself.