[Healeys] Core plug query

[Bob Spidell]

I did a little diggin ...

Apparently, they are designed to melt if the engine overheats, which 
would be grounds for voiding the warranty on a re-man. I wonder if the 
plug is made of bismuth, which is what sets off automatic fire sprinklers.

https://www.toyotanation.com/threads/mysterious-plugs-in-engine-block.1659464/

On 10/31/2025 5:08 AM, Simon Lachlan via Healeys wrote:
>
> I saw this on Facebookjust now. Just curious….what’sthat thing in the 
> middle of thecore plug? And,if it’s a good thing, whydon’t all the 
> plugs have one?
>
> Thanks, Simon
>
>
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