Freeze/Core Plugs

What is a Freeze Plug?

A freeze plug, also known as a core plug, is a small disc-shaped plug made of metal that is used in the engine block and cylinder head of an internal combustion engine. Its primary purpose is to seal the openings left during the manufacturing process of the engine's casting. These openings are used to remove sand and other debris that can accumulate during the casting process. Once the casting is complete, freeze plugs are installed to seal these openings and prevent any leaks.

What is a Core Plug Used For?

Core plugs, also called freeze plugs, serve a crucial role in an engine's design. Besides sealing the openings left during casting, core plugs are designed to provide a point of access for cleaning and maintenance of the cooling passages within the engine block. Over time, the core plugs can deteriorate due to corrosion or engine heat, potentially leading to leaks. It's important to regularly inspect these plugs and replace them as needed to prevent coolant leaks that can lead to overheating and engine damage.

Freeze Plug Vs. Core Plug

The terms "freeze plug" and "core plug" are often used interchangeably to refer to the same engine component. However, the term "freeze plug" can be misleading, as these plugs are not designed to protect the engine from freezing. Instead, they serve as access points during the manufacturing process and allow for maintenance. Regardless of the term used, these plugs play an essential role in maintaining the integrity of an engine's cooling system.

At JEGS, we offer a variety of freeze plugs and core plugs to suit different engine types and applications. Proper maintenance and replacement of these plugs can help ensure the reliability and performance of your engine.