[Healeys] Core plug query

[Michael Oritt]

Good catch Bob!  Wow, it wouldn't be such a super thing to have the plug go
away....

Best--Michael Oritt

On Fri, Oct 31, 2025 at 10:39 AM Bob Spidell via Healeys <
healeys at autox.team.net> wrote:

> 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 Facebook just now. Just curious….what’s that thing in the
> middle of the core plug? And, if it’s a good thing, why don’t all the
> plugs have one?
>
> Thanks, Simon
>
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