How Do You Seal a Freeze Plug

Clean the surface with some brake cleaner and wipe dry. Then prep the plug with some Permatex Form-A-Gasket #1 sealant. This product is designed for freeze plugs and other press-fit applications, as well as gaskets. Just a thin coating is all you need.

How do you stop a freeze plug from leaking?

Seal up the crack or leak in the freeze plug with a sealant. This solution may only be temporary, and many damaged freeze plugs need to be completely replaced. The sealant will prevent further leaking until you have the replacement parts necessary.

Can you replace freeze plugs without removing the engine?

The freeze plugs are often made of metal (sometimes plastic) and are inserted into the core bores by friction fitting. Over time, the core plugs will leak due to corrosion from the cooling water system. They must then be removed without damaging the engine block.