Subject: Re: [Healeys] Core plug query

From: JSARCH via Healeys <[email-masked]>
Date: Mon, 3 Nov 2025 15:43:41 -0300

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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 <[email-masked]> On Behalf Of Bob Spidell =
via Healeys
Sent: Friday, October 31, 2025 11:13 AM
To: [email-masked]
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>&nbsp;</=
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 &lt;[email-masked]&gt; <b>On Behalf Of </b>Bob =
Spidell via Healeys<br><b>Sent:</b> Friday, October 31, 2025 11:13 =
AM<br><b>To:</b> [email-masked]<br><b>Subject:</b> Re: [Healeys] =
Core plug query<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>I did a little diggin =
...&nbsp;<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>&nbsp;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>&nbsp;</o:p></p></blockquote></div></body></html>
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_______________________________________________

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive/healeys

[email-masked]
http://autox.team.net/mailman/listinfo/healeys

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From: <[email-masked]>
Date: Mon, 3 Nov 2025 17:01:08 -0600

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JSARCH is correct for many types of modern sprinkler heads, but there =
are still several types that use one form or another of fusible links.  =
I apologize for being a pedant on this topic (sorry, it is what I do =
=E2=80=93 both being a pedant and design of automatic fire protection =
systems).

=20

Mandatory Healey content : what is the advantage of draining the water =
from one=E2=80=99s cooling system if the engine is overheating?

=20

Thanks.

=20

Bob England

=20

From: Healeys <[email-masked]> On Behalf Of JSARCH via =
Healeys
Sent: November 3, 2025 12:44 PM
To: 'Bob Spidell' <[email-masked]>; [email-masked]
Subject: Re: [Healeys] Core plug query

=20

=20

From: Healeys <[email-masked] =
Healeys
Sent: Friday, October 31, 2025 11:13 AM
Subject: Re: [Healeys] Core plug query

=20

Thanks, Simon

=20

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--></style></head><body lang=3DEN-CA link=3Dblue vlink=3Dpurple =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><font size=3D1 face=3D"Century Gothic"><span =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif;mso-fareast-language:EN-US'>JSARCH is correct for =
many types of modern sprinkler heads, but there are still several types =
that use one form or another of fusible links.=C2=A0 I apologize for =
being a pedant on this topic (sorry, it is what I do =E2=80=93 both =
being a pedant and design of automatic fire protection =
systems).<o:p></o:p></span></font></p><p class=3DMsoNormal><font =
size=3D1 face=3D"Century Gothic"><span =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></=
font></p><p class=3DMsoNormal><font size=3D1 face=3D"Century =
Gothic"><span style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif;mso-fareast-language:EN-US'>Mandatory Healey content =
: what is the advantage of draining the water from one=E2=80=99s cooling =
system if the engine is overheating?<o:p></o:p></span></font></p><p =
class=3DMsoNormal><font size=3D1 face=3D"Century Gothic"><span =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></=
font></p><p class=3DMsoNormal><font size=3D1 face=3D"Century =
Gothic"><span style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif;mso-fareast-language:EN-US'>Thanks.<o:p></o:p></span><=
/font></p><p class=3DMsoNormal><font size=3D1 face=3D"Century =
Gothic"><span style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></=
font></p><div><p class=3DMsoNormal><b><font size=3D2 color=3Dnavy =
face=3D"Century Gothic"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Century =
Gothic",sans-serif;color:navy;mso-ligatures:standardcontextual;font-weigh=
t:bold'>Bob England<br><br></span></font></b><font face=3D"Century =
Gothic"><span style=3D'font-family:"Century =
Gothic",sans-serif;mso-ligatures:standardcontextual'><o:p></o:p></span></=
font></p></div><p class=3DMsoNormal><font size=3D1 face=3D"Century =
Gothic"><span style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></=
font></p><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in;font-size:pt'><p =
class=3DMsoNormal><b><font size=3D3 face=3DCalibri><span lang=3DEN-GB =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif;font-weight:bo=
ld'>From:</span></font></b><font face=3DCalibri><span lang=3DEN-GB =
style=3D'font-family:"Calibri",sans-serif'> Healeys =
&lt;[email-masked]&gt; <b><span =
style=3D'font-weight:bold'>On Behalf Of </span></b>JSARCH via =
Healeys<br><b><span style=3D'font-weight:bold'>Sent:</span></b> November =
3, 2025 12:44 PM<br><b><span style=3D'font-weight:bold'>To:</span></b> =
'Bob Spidell' &lt;[email-masked]&gt;; =
[email-masked]<br><b><span =
style=3D'font-weight:bold'>Subject:</span></b> Re: [Healeys] Core plug =
query<o:p></o:p></span></font></p></div></div><p class=3DMsoNormal><font =
size=3D3 face=3DAptos><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p><p =
class=3DMsoNormal><font size=3D2 face=3DCalibri><span lang=3DEN-US =
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></font></p><p class=3DMsoNormal><font size=3D2 =
face=3DCalibri><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></font></p><div><div style=3D'border:none;border-top:solid =
#E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><font =
size=3D2 face=3DCalibri><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;font-weight:bo=
ld'>From:</span></font></b><font size=3D2 face=3DCalibri><span =
lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> Healeys =
&lt;<a =
href=3D"mailto:[email-masked]">[email-masked]=
.net</a>&gt; <b><span style=3D'font-weight:bold'>On Behalf Of =
</span></b>Bob Spidell via Healeys<br><b><span =
style=3D'font-weight:bold'>Sent:</span></b> Friday, October 31, 2025 =
11:13 AM<br><b><span style=3D'font-weight:bold'>To:</span></b> <a =
href=3D"mailto:[email-masked]">[email-masked]</a><br><b><=
span style=3D'font-weight:bold'>Subject:</span></b> Re: [Healeys] Core =
plug query<o:p></o:p></span></font></p></div></div><p =
class=3DMsoNormal><font size=3D3 face=3DAptos><span lang=3DEN-US =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D3 =
face=3DAptos><span lang=3DEN-US style=3D'font-size:12.0pt'>I did a =
little diggin ...&nbsp;<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></span></font></p><div><p =
class=3DMsoNormal><font size=3D3 face=3DAptos><span lang=3DEN-US =
style=3D'font-size:12.0pt'>On 10/31/2025 5:08 AM, Simon Lachlan via =
Healeys wrote:<o:p></o:p></span></font></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p><font size=3D3 =
face=3DAptos><span lang=3DEN-GB style=3D'font-size:12.0pt'>&nbsp;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></font><span =
lang=3DEN-US><o:p></o:p></span></p><p><font size=3D3 face=3DAptos><span =
lang=3DEN-GB style=3D'font-size:12.0pt'>Thanks, Simon</span></font><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal><font size=3D3 =
face=3DAptos><span lang=3DEN-US =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p></blockquot=
e></div></body></html>
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[email-masked]

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---

From: "JSARCH" <[email-masked]>
Date: Tue, 4 Nov 2025 12:19:33 -0300

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Perhaps the thinking is draining the water will keep the system from =
being over pressurized and prevent hoses from rupturing?

=20

John=20

=20

From: [email-masked] <[email-masked]>=20
Sent: Monday, November 3, 2025 8:01 PM
To: [email-masked]
Cc: 'Bob Spidell' <[email-masked]>; 'JSARCH' =
<[email-masked]>
Subject: RE: [Healeys] Core plug query

=20

=20

=20

Thanks.

=20

Bob England

=20

=20

=20

=20

Thanks, Simon

=20

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style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Perhaps the =
thinking is draining the water will keep the system from being over =
pressurized and prevent hoses from rupturing?<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>John =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
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'> =
[email-masked] &lt;[email-masked]&gt; <br><b>Sent:</b> Monday, =
November 3, 2025 8:01 PM<br><b>To:</b> =
[email-masked]<br><b>Cc:</b> 'Bob Spidell' =
&lt;[email-masked]&gt;; 'JSARCH' =
&lt;[email-masked]&gt;<br><b>Subject:</b> RE: [Healeys] Core =
plug query<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DEN-CA style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif'>JSARCH is correct for many types of modern sprinkler =
heads, but there are still several types that use one form or another of =
fusible links.&nbsp; I apologize for being a pedant on this topic =
(sorry, it is what I do =E2=80=93 both being a pedant and design of =
automatic fire protection systems).<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif'>Mandatory Healey content : what is the advantage of =
draining the water from one=E2=80=99s cooling system if the engine is =
overheating?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif'>Thanks.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif'><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><b><span =
style=3D'font-size:10.0pt;font-family:"Century =
Gothic",sans-serif;color:navy;mso-ligatures:standardcontextual'>Bob =
England</span></b><span lang=3DEN-CA style=3D'font-family:"Century =
Gothic",sans-serif;mso-ligatures:standardcontextual'><o:p></o:p></span></=
p></div><p class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:9.0pt;font-family:"Century =
Gothic",sans-serif'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in;font-size:pt'><p class=3DMsoNormal><b><span lang=3DEN-GB =
style=3D'font-family:"Calibri",sans-serif'>From:</span></b><span =
lang=3DEN-GB style=3D'font-family:"Calibri",sans-serif'> Healeys &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]=
.net</a>&gt; <b>On Behalf Of </b>JSARCH via Healeys<br><b>Sent:</b> =
November 3, 2025 12:44 PM<br><b>To:</b> 'Bob Spidell' &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt;; <a =
href=3D"mailto:[email-masked]">[email-masked]</a><br><b>S=
ubject:</b> Re: [Healeys] Core plug =
query<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-CA><o:p>&nbsp;</o:p></span></p><p 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>&nbsp;</=
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 &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]=
.net</a>&gt; <b>On Behalf Of </b>Bob Spidell via Healeys<br><b>Sent:</b> =
Friday, October 31, 2025 11:13 AM<br><b>To:</b> <a =
href=3D"mailto:[email-masked]">[email-masked]</a><br><b>S=
ubject:</b> Re: [Healeys] Core plug =
query<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>I did a little diggin =
...&nbsp;<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>&nbsp;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>&nbsp;</o:p></p></blockquote></div></body></html>
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