[Healeys] Core plug query

[David Nock]

That is at tab that we install on all engines after repairing cooling 
systems, or rebuilds. They are desigened to fall off it the engine is 
overheated. We usually install on one of the rear core plugs.

-- 
David Nock
British Car Specialists
Stockton Ca
209 948 8767
www.britishcarspecialists.com



On 10/31/2025 8:44 AM, Michael Oritt wrote:
> 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 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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