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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.
Best--Michael Oritt
On Sat, Oct 11, 2025 at 2:24=E2=80=AFPM sbyers--- via Healeys <
healeys@autox.team.net> wrote:
> 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.
>
>
>
> Steve Byers
>
> BJ8 Registry
>
> AHCA Delegate at Large
>
>
>
> *From:* Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Simon
> Lachlan via 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=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
> _______________________________________________
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> Archive: http://www.team.net/pipermail/healeys
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>
>
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">By ru=
nning the hose from the radiator neck to the <i><b>bottom</b></i> of the &q=
uot;expansion" tank you will have created a coolant recovery system--t=
he slight vacuum created in the radiator by the engine's cooling down p=
ulls open and unseals the pressure plate on the radiator cap, thus "re=
covering" the overflow back into=C2=A0the radiator.=C2=A0 Probable=C2=
=A0result:=C2=A0 no more coolant on the garage floor and no need to top thi=
ngs off.=C2=A0</div><div class=3D"gmail_default" style=3D"color:#3333ff"><b=
r></div><div class=3D"gmail_default" style=3D"color:#3333ff">Best--Michael =
Oritt</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div =
dir=3D"ltr" class=3D"gmail_attr">On Sat, Oct 11, 2025 at 2:24=E2=80=AFPM sb=
yers--- via Healeys <<a href=3D"mailto:healeys@autox.team.net";>healeys@a=
utox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex"><div class=3D"msg4813553479534083906"><div lang=3D"EN-US" styl=
e=3D"overflow-wrap: break-word;"><div class=3D"m_4813553479534083906WordSec=
tion1"><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=
=3D"font-size:11pt">Simon, I have an expansion tank in my BJ8 using the ori=
ginal metal tank from an MG Midget.<span>=C2=A0 </span>I also have the stoc=
k 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.<span>=C2=A0 </s=
pan>The tank captures any overflow from the radiator and I can see the syst=
em operate with the clear tubing.<span>=C2=A0 </span>When hot, the flow is =
out to the tank and back into the radiator as it cools.<span>=C2=A0 </span>=
Excess coolant in the overflow tank can flow out to the ground through the =
tank overflow connection.<u></u><u></u></span></font></p><p class=3D"MsoNor=
mal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></font></p><p class=3D"MsoNormal"><font size=3D"2" face=
=3D"Aptos"><span style=3D"font-size:11pt">Steve Byers<u></u><u></u></span><=
/font></p><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span styl=
e=3D"font-size:11pt">BJ8 Registry<u></u><u></u></span></font></p><p class=
=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11p=
t">AHCA Delegate at Large<u></u><u></u></span></font></p><p class=3D"MsoNor=
mal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></font></p><div><div style=3D"border-right:none;border-=
bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:=
3pt 0in 0in"><p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><s=
pan style=3D"font-size:11pt;font-family:Calibri,sans-serif;font-weight:bold=
">From:</span></font></b><font size=3D"2" face=3D"Calibri"><span style=3D"f=
ont-size:11pt;font-family:Calibri,sans-serif"> Healeys <<a href=3D"mailt=
o:healeys-bounces@autox.team.net" target=3D"_blank">healeys-bounces@autox.t=
eam.net</a>> <b><span style=3D"font-weight:bold">On Behalf <span class=
=3D"m_4813553479534083906GramE">Of</span> </span></b>Simon Lachlan via Heal=
eys<br><b><span style=3D"font-weight:bold">Sent:</span></b> Saturday, Octob=
er 11, 2025 11:32 AM<br><b><span style=3D"font-weight:bold">To:</span></b> =
'Healeys' <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_=
blank">healeys@autox.team.net</a>><br><b><span style=3D"font-weight:bold=
">Subject:</span></b> [Healeys] Radiator cap with expansion tank.<u></u><u>=
</u></span></font></p></div></div><p class=3D"MsoNormal"><font size=3D"3" f=
ace=3D"Aptos"><span style=3D"font-size:12pt"><u></u>=C2=A0<u></u></span></f=
ont></p><p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"fo=
nt-size:12pt">Forgive another stupid question but it=E2=80=99s sensible to =
be sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><u></u><u></u></font></p><p><font=
size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-size:12pt">Am=
I right in assuming(!) that, if one fits an expansion tank, the standard c=
ap is moved from the radiator to the expansion tank and is replaced by a bl=
anking(?) cap ie one which has no spring, no means of relief etcetc? Seem l=
ogical to me but logic has let me down before.</span><u></u><u></u></font><=
/p><p><font size=3D"3" face=3D"Aptos"><span lang=3D"EN-GB" style=3D"font-si=
ze:12pt">Simon</span><u></u><u></u></font></p></div></div>_________________=
______________________________<br>
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Archive: <a href=3D"http://www.team.net/pipermail/healeys"; rel=3D"noreferre=
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ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
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</div></blockquote></div>
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_______________________________________________
Archive: http://www.team.net/pipermail/healeys
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