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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.
Exhaust Manifold Gasket. The exhaust manifold gasket is the working seal between the exhaust manifold and the cylinder head. Symptoms of Wear or Failure. 1  A ticking or tapping noise, especially when the engine is cold. 2  Unusual smell from exhaust. 3  Check Engine Light may come on.