Core plug meaning

Core plug definition

A metal plug located in the sides of the engine block which can pop out because of excessive pressure or freezing and prevent the engine block from cracking . These plugs can sometimes leak and should then be replaced. Block heaters are installed by removing a core plug and inserting a heating element. Core plugs are also called "freeze plugs" or "expansion plugs."

Automotive Dictionary Index

Automotive terms beginning with "C", page 35

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