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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 <healeys-bounces@autox.team.net> On Behalf Of JSARCH via =
Healeys
Sent: November 3, 2025 12:44 PM
To: 'Bob Spidell' <bspidell@comcast.net>; healeys@autox.team.net
Subject: Re: [Healeys] Core plug query
=20
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 =
Healeys
Sent: Friday, October 31, 2025 11:13 AM
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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--></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> </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> </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> </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> </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 =
<healeys-bounces@autox.team.net> <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' <bspidell@comcast.net>; =
healeys@autox.team.net<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> </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> </=
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 =
<<a =
href=3D"mailto:healeys-bounces@autox.team.net";>healeys-bounces@autox.team=
.net</a>> <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:healeys@autox.team.net";>healeys@autox.team.net</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> </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 ... <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'> 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> </o:p></span></font></p></blockquot=
e></div></body></html>
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