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Re: [Healeys] Radiator cap with expansion tank.

To: "simon.lachlan@alexarevel.plus.com" <simon.lachlan@alexarevel.plus.com>, 'Healeys' <healeys@autox.team.net>, "sbyers@ec.rr.com" <sbyers@ec.rr.com>
Subject: Re: [Healeys] Radiator cap with expansion tank.
From: healeybruce--- via Healeys <healeys@autox.team.net>
Date: Sun, 19 Oct 2025 21:45:31 +0000
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Thread-topic: [Healeys] Radiator cap with expansion tank.
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I'm installing an expansion tank from an MGB on my BN7.  Per Dave Nock, I'm=
 using a 7-pound cap on the radiator and a 10-pound cap on the expansion ta=
nk.  The car is not back from paint yet, but that's what I'm going with.
________________________________
From: Healeys <healeys-bounces@autox.team.net> on behalf of sbyers--- via H=
ealeys <healeys@autox.team.net>
Sent: Saturday, October 11, 2025 10:33 AM
To: simon.lachlan@alexarevel.plus.com <simon.lachlan@alexarevel.plus.com>; =
'Healeys' <healeys@autox.team.net>
Subject: Re: [Healeys] Radiator cap with expansion tank.


Simon, I have an expansion tank in my BJ8 using the original metal tank fro=
m an MG Midget.  I also have the stock 7 psi cap on both the radiator and t=
he overflow tank and a clear =93overflow=94 hose on the radiator neck to th=
e tank.  The tank captures any overflow from the radiator and I can see the=
 system operate with the clear tubing.  When hot, the flow is out to the ta=
nk and back into the radiator as it cools.  Excess coolant in the overflow =
tank can flow out to the ground through the tank overflow connection.



Steve Byers

BJ8 Registry

AHCA Delegate at Large



From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Simon Lachlan v=
ia Healeys
Sent: Saturday, October 11, 2025 11:32 AM
To: 'Healeys' <healeys@autox.team.net>
Subject: [Healeys] Radiator cap with expansion tank.



Forgive another stupid question but it=92s sensible to be sure=85=85=85.

Am I right in assuming(!) that, if one fits an expansion tank, the standard=
 cap is moved from the radiator to the expansion tank and is replaced by a =
blanking(?) cap ie one which has no spring, no means of relief etcetc? Seem=
 logical to me but logic has let me down before.

Simon

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I'm installing an expansion tank from an MGB on my BN7.&nbsp; Per Dave Nock=
, I'm using a 7-pound cap on the radiator and a 10-pound cap on the expansi=
on tank.&nbsp; The car is not back from paint yet, but that's what I'm goin=
g with.</div>
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<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys &lt;healeys-b=
ounces@autox.team.net&gt; on behalf of sbyers--- via Healeys &lt;healeys@au=
tox.team.net&gt;<br>
<b>Sent:</b> Saturday, October 11, 2025 10:33 AM<br>
<b>To:</b> simon.lachlan@alexarevel.plus.com &lt;simon.lachlan@alexarevel.p=
lus.com&gt;; 'Healeys' &lt;healeys@autox.team.net&gt;<br>
<b>Subject:</b> Re: [Healeys] Radiator cap with expansion tank.</font>
<div>&nbsp;</div>
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<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">Simon, I have an expansion tank in my BJ8 using the original=
 metal tank from an MG Midget.<span style=3D"">&nbsp;
</span>I also have the stock 7 psi cap on both the radiator and the overflo=
w tank and a clear =93overflow=94 hose on the radiator neck to the tank.<sp=
an style=3D"">&nbsp;
</span>The tank captures any overflow from the radiator and I can see the s=
ystem operate with the clear tubing.<span style=3D"">&nbsp;
</span>When hot, the flow is out to the tank and back into the radiator as =
it cools.<span style=3D"">&nbsp;
</span>Excess coolant in the overflow tank can flow out to the ground throu=
gh the tank overflow connection.</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">&nbsp;</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">Steve Byers</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">BJ8 Registry</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">AHCA Delegate at Large</span></font></p>
<p class=3D"x_MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"fon=
t-size:11.0pt">&nbsp;</span></font></p>
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le=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sans-serif">
 Healeys &lt;healeys-bounces@autox.team.net&gt; <b><span style=3D"font-weig=
ht:bold">On Behalf
<span class=3D"x_GramE">Of</span> </span></b>Simon Lachlan via Healeys<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> Saturday, October 11, =
2025 11:32 AM<br>
<b><span style=3D"font-weight:bold">To:</span></b> 'Healeys' &lt;healeys@au=
tox.team.net&gt;<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> [Healeys] Radiator =
cap with expansion tank.</span></font></p>
</div>
</div>
<p class=3D"x_MsoNormal"><font size=3D"3" face=3D"Aptos"><span style=3D"fon=
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<p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:=
12.0pt">Forgive another stupid question but it=92s sensible to be sure=85=
=85=85.</span></font></p>
<p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:=
12.0pt">Am I right in assuming(!) that, if one fits an expansion tank, the =
standard cap is moved from the radiator to the expansion tank and is replac=
ed by a blanking(?) cap ie one which has
 no spring, no means of relief etcetc? Seem logical to me but logic has let=
 me down before.</span></font></p>
<p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:=
12.0pt">Simon</span></font></p>
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