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Crankcase emission controls are systems designed to reduce or eliminate the release of harmful gases and vapors from the engine's crankcase, which can occur during engine operation. These emissions primarily consist of unburned hydrocarbons, which can contribute to air pollution. Common methods of control include Positive Crankcase Ventilation (PCV) systems, which redirect crankcase gases back into the intake manifold for re-combustion, and the use of oil separators. Implementing these controls helps to improve air quality and complies with environmental regulations.

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