Re: [Healeys] Core plug query

[Alan Seigrist <healey.nut@gmail.com>]

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I had to replace that plug on my BJ8 once, and rather than pulling the
head, I just got one of those squeezing rubber bolt on types that you
tighten down with a nut.  worked perfectly.  This looks like some variation
of the same.

On Fri, Oct 31, 2025 at 12:03=E2=80=AFPM Michael Oritt <michael.oritt@gmail=
.com>
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=E2=80=AFAM Bob Spidell via Healeys <
> healeys@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 p=
lug
>> is made of bismuth, which is what sets off automatic fire sprinklers.
>>
>>
>> https://www.toyotanation.com/threads/mysterious-plugs-in-engine-block.16=
59464/
>>
>> 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 t=
hat 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?
>>
>> Thanks, Simon
>>
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<div dir=3D"ltr">I had to replace that plug on my BJ8 once, and rather than=
 pulling the head, I just got one of those squeezing rubber bolt on types t=
hat you tighten down with a nut.=C2=A0 worked perfectly.=C2=A0 This looks l=
ike some variation of the same.</div><br><div class=3D"gmail_quote gmail_qu=
ote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Oct 31, 2025 a=
t 12:03=E2=80=AFPM Michael Oritt &lt;<a href=3D"mailto:michael.oritt@gmail.=
com">michael.oritt@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" s=
tyle=3D"color:rgb(51,51,255)">Good catch Bob!=C2=A0 Wow, it wouldn&#39;t be=
 such a super thing to have the plug go away....</div><div class=3D"gmail_d=
efault" style=3D"color:rgb(51,51,255)"><br></div><div class=3D"gmail_defaul=
t" style=3D"color:rgb(51,51,255)">Best--Michael Oritt=C2=A0</div></div><br>=
<div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Oc=
t 31, 2025 at 10:39=E2=80=AFAM Bob Spidell via Healeys &lt;<a href=3D"mailt=
o:healeys@autox.team.net" target=3D"_blank">healeys@autox.team.net</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>

 =20
   =20
 =20
  <div>
    I did a little diggin ...=C2=A0<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-=
block.1659464/" target=3D"_blank">https://www.toyotanation.com/threads/myst=
erious-plugs-in-engine-block.1659464/</a><br>
    <br>
    <div>On 10/31/2025 5:08 AM, Simon Lachlan
      via Healeys wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
     =20
     =20
     =20
      <p dir=3D"LTR"><span lang=3D"en-gb"></span><span lang=3D"en-gb"></spa=
n><span lang=3D"en-gb"></span><span lang=3D"en-gb">=C2=A0<font face=3D"Apto=
s">I
            saw this on Facebook</font></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">
            just now. Just curious=E2=80=A6.what</font></span><span lang=3D=
"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=
=3D"Aptos">=E2=80=99s</font></span><span lang=3D"en-gb"></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos"> that thing in =
the middle of
            th</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb=
"></span><span lang=3D"en-gb"><font face=3D"Aptos">e</font></span><span lan=
g=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"> <font =
face=3D"Aptos">core plug</font></span><span lang=3D"en-gb"></span><span lan=
g=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">? And</font></=
span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"=
en-gb"><font face=3D"Aptos">,</font></span><span lang=3D"en-gb"></span><spa=
n lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos"> if it=E2=
=80=99s a good thing, why</font></span><span lang=3D"en-gb"></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"> <font face=3D"Aptos">don=E2=80=99=
t all the plugs have
            one? </font></span></p>
      <p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Aptos">Thanks, Simo=
n</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><spa=
n lang=3D"en-gb"></span></p>
      <br>
    </blockquote>
  </div>

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