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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/
https://www.corvetteforum.com/forums/c4-general-discussion/4233738-warranty-void-if-removed.html
On 10/31/2025 5:08 AM, Simon Lachlan via Healeys wrote:
>
> I saw this on Facebookjust now. Just curiousâ?¦.whatâ??sthat thing in the
> middle of thecore plug? And,if itâ??s a good thing, whydonâ??t all the
> plugs have one?
>
> Thanks, Simon
>
>
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I did a little diggin ... <br>
<br>
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.<br>
<br>
<a class="moz-txt-link-freetext"
href="https://www.toyotanation.com/threads/mysterious-plugs-in-engine-block.1659464/";>https://www.toyotanation.com/threads/mysterious-plugs-in-engine-block.1659464/</a><br>
<br>
<a class="moz-txt-link-freetext"
href="https://www.corvetteforum.com/forums/c4-general-discussion/4233738-warranty-void-if-removed.html";>https://www.corvetteforum.com/forums/c4-general-discussion/4233738-warranty-void-if-removed.html</a><br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/31/2025 5:08 AM, Simon Lachlan
via Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:002801dc4a5f$0751eb70$15f5c250$@alexarevel.plus.com">
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<p dir="LTR"><span lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb">Â <font face="Aptos">I
saw this on Facebook</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font face="Aptos">
just now. Just curiousâ?¦.what</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Aptos">â??s</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos"> that thing in the middle of
th</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Aptos">e</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"> <font face="Aptos">core plug</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos">? And</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos">,</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos"> if itâ??s a good thing,
why</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"> <font face="Aptos">donâ??t all the plugs have
one? </font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Aptos">Thanks,
Simon</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span></p>
<br>
</blockquote>
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