Automotive Systems

Formerly Automotive Systems I

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Manifold Heat Control Valve

On some gasoline engines, a valve is placed in the exhaust manifold to deflect exhaust gases toward a hot spot in the intake manifold until the engine reaches operating temperature (fig. 4-48). This valve is a flat metal plate that is the same shape as the opening that controls it. It pivots on a shaft and is operated by a thermostatic coil spring. The spring pulls the valve closed against a counterweight before warm-up. The spring expands as the engine warms up, and the counterweight pulls the valve open.

Figure 4-48.—Manifold heat control valve.
Published by SweetHaven Publishing Services
Based upon a text provided by the U.S. Navy

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