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More often than not, automatic fire sprinklers are activated by a glass =
bulb filed with a liquid that expands and breaks the bulb which then =
opens the fire sprinkler head. Bismuth is used in fusible links which =
that melt at certain temperatures to activate automatic fire doors.
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Bob Spidell =
via Healeys
Sent: Friday, October 31, 2025 11:13 AM
To: healeys@autox.team.net
Subject: Re: [Healeys] Core plug query
=20
I did a little diggin ...=20
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.165=
9464/
On 10/31/2025 5:08 AM, Simon Lachlan via Healeys wrote:
I saw this on Facebook just now. Just curious=E2=80=A6.what=E2=80=99s =
that thing in the middle of the core plug? And, if it=E2=80=99s a good =
thing, why don=E2=80=99t all the plugs have one?=20
Thanks, Simon
=20
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class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>More often =
than not, automatic fire sprinklers are activated by a glass bulb filed =
with a liquid that expands and breaks the bulb which then opens the fire =
sprinkler head. Bismuth is used in fusible links which that melt at =
certain temperatures to activate automatic fire =
doors.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </=
o:p></span></p><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Healeys <healeys-bounces@autox.team.net> <b>On Behalf Of </b>Bob =
Spidell via Healeys<br><b>Sent:</b> Friday, October 31, 2025 11:13 =
AM<br><b>To:</b> healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] =
Core plug query<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>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 =
href=3D"https://www.toyotanation.com/threads/mysterious-plugs-in-engine-b=
lock.1659464/">https://www.toyotanation.com/threads/mysterious-plugs-in-e=
ngine-block.1659464/</a><o:p></o:p></p><div><p class=3DMsoNormal>On =
10/31/2025 5:08 AM, Simon Lachlan via Healeys =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p><span =
lang=3DEN-GB> I saw this on Facebook just now. Just =
curious=E2=80=A6.what=E2=80=99s that thing in the middle of the core =
plug? And, if it=E2=80=99s a good thing, why don=E2=80=99t all the plugs =
have one? </span><o:p></o:p></p><p><span lang=3DEN-GB>Thanks, =
Simon</span><o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p></blockquote></div></body></html>
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