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All you really need to do is to not top off the radiator coolant. Keep =
the coolant level 1=E2=80=9D to 1-1/2=E2=80=9D or possible a little more =
below the point where the radiator cap seals the top of the radiator =
chamber will allow enough space for the coolant to expand and contract =
without sending coolant through the overflow tube.
=20
Best - John=20
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Michael =
Oritt via Healeys
Sent: Saturday, October 11, 2025 4:02 PM
To: sbyers@ec.rr.com
Cc: Healeys <healeys@autox.team.net>
Subject: Re: [Healeys] Radiator cap with expansion tank.
=20
By running the hose from the radiator neck to the bottom of the =
"expansion" tank you will have created a coolant recovery system--the =
slight vacuum created in the radiator by the engine's cooling down pulls =
open and unseals the pressure plate on the radiator cap, thus =
"recovering" the overflow back into the radiator. Probable result: no =
more coolant on the garage floor and no need to top things off.=20
=20
Best--Michael Oritt
=20
On Sat, Oct 11, 2025 at 2:24=E2=80=AFPM sbyers--- via Healeys =
Simon, I have an expansion tank in my BJ8 using the original metal tank =
from an MG Midget. I also have the stock 7 psi cap on both the radiator =
and the overflow tank and a clear =E2=80=9Coverflow=E2=80=9D hose on the =
radiator neck to the 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 tank 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.
=20
Steve Byers
BJ8 Registry
AHCA Delegate at Large
=20
From: Healeys <healeys-bounces@autox.team.net =
Healeys
Sent: Saturday, October 11, 2025 11:32 AM
Subject: [Healeys] Radiator cap with expansion tank.
=20
Forgive another stupid question but it=E2=80=99s sensible to be =
sure=E2=80=A6=E2=80=A6=E2=80=A6.
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
_______________________________________________
Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys
http://autox.team.net/mailman/listinfo/healeys
http://autox.team.net/mailman/options/healeys/michael.oritt@gmail.com
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<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3Dpurple =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>All you =
really need to do is to not top off the radiator coolant. Keep the =
coolant level 1=E2=80=9D to 1-1/2=E2=80=9D or possible a little more =
below the point where the radiator cap seals the top of the radiator =
chamber will allow enough space for the coolant to expand and contract =
without sending coolant through the overflow =
tube.<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><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Best - John =
<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 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>Michael Oritt via Healeys<br><b>Sent:</b> Saturday, October 11, 2025 =
4:02 PM<br><b>To:</b> sbyers@ec.rr.com<br><b>Cc:</b> Healeys =
<healeys@autox.team.net><br><b>Subject:</b> Re: [Healeys] Radiator =
cap with expansion tank.<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>By running the hose from =
the radiator neck to the <b><i>bottom</i></b> of the =
"expansion" tank you will have created a coolant recovery =
system--the slight vacuum created in the radiator by the engine's =
cooling down pulls open and unseals the pressure plate on the radiator =
cap, thus "recovering" the overflow back into the =
radiator. Probable result: no more coolant on the =
garage floor and no need to top things =
off. <o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'color:#3333FF'><o:p> </o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>Best--Michael =
Oritt<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On =
Sat, Oct 11, 2025 at 2:24<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>PM sbyers--- =
via Healeys <<a =
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>Simon, I have an expansion tank in my BJ8 =
using the original metal tank from an MG Midget. I also have the =
stock 7 psi cap on both the radiator and the overflow tank and a clear =
=E2=80=9Coverflow=E2=80=9D hose on the radiator neck to the 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 tank 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.</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'> </span><o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>Steve Byers</span><o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>BJ8 Registry</span><o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'>AHCA Delegate at =
Large</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt'> </span><o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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 <<a href=3D"mailto:healeys-bounces@autox.team.net"; =
target=3D"_blank">healeys-bounces@autox.team.net</a>> <b>On Behalf =
<span class=3Dm4813553479534083906grame>Of</span> </b>Simon Lachlan via =
Healeys<br><b>Sent:</b> Saturday, October 11, 2025 11:32 =
AM<br><b>To:</b> 'Healeys' <<a href=3D"mailto:healeys@autox.team.net"; =
target=3D"_blank">healeys@autox.team.net</a>><br><b>Subject:</b> =
[Healeys] Radiator cap with expansion =
tank.</span><o:p></o:p></p></div></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p><span lang=3DEN-GB>Forgive another stupid question but =
it=E2=80=99s sensible to be =
sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><o:p></o:p></p><p><span =
lang=3DEN-GB>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.</span><o:p></o:p></p><p><span =
lang=3DEN-GB>Simon</span><o:p></o:p></p></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a href=3D"http://www.team.net/donate.html"; =
target=3D"_blank">http://www.team.net/donate.html</a><br>Suggested =
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ritt@gmail.com</a><o:p></o:p></p></div></blockquote></div></div></body></=
html>
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_______________________________________________
Archive: http://www.team.net/pipermail/healeys
http://autox.team.net/archive/healeys
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
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