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Would it be safe to say that closing off that if one was not using a
thermostat closing off that passage in the water pump, with say a brass
plug, would be as effective as the blanking sleeve?
On Tue., Mar. 29, 2022, 1:19 p.m. Harold Manifold, <manifold@telus.net>
wrote:
> The coolant bypass plays an important but problematic role in the Healey=
=E2=80=99s
> cooling system. When the thermostat is closed coolant returns to the wate=
r
> pump via the bypass. See the red circle on the attached picture. The bypa=
ss
> is important for three reasons: its allows the coolant in the block to
> continue to circulate and come to a uniform temperature before the
> thermostat opens, it prevents hot spots that could develop from stagnant
> coolant and it prevents the water pump from dead heading.
>
>
>
> The problematic part is in the original design the bypass was closed by a
> sleeve on the bellows type thermostat when the thermostat opened. The
> original Bellows type thermostat used a volatile liquid and were not
> reliable and were not suitable for the 7 psi cooling system pressure. Wax
> type thermostats are much more reliable but they do not have a sleeve to
> close off the bypass. There may be some expensive wax type replicas of th=
e
> original bellows type.
>
>
>
> After looking at many options the best option for a reasonably priced wax
> type thermostat with a sleeve to close off the bay pass is the modified
> Land Rover Series ll thermostat. If anyone would like to know about
> modifying the Landver thermostat let me know. It can be easily done.
>
>
>
> Harold
>
>
>
> *From: *Michael Salter via Healeys <healeys@autox.team.net>
> *Sent: *Tuesday, March 29, 2022 9:17 AM
> *To: *Healey list <Healeys@autox.team.net>
> *Subject: *Re: [Healeys] Coolant bypass port in the head - 6-cyl
>
>
>
> The coolant travels from the bottom of the radiator to the water pump int=
o
> the block then from the block into the head then through the thermostat t=
o
> the top of the radiator.
>
>
>
> M
>
>
>
> On Tue., Mar. 29, 2022, 11:57 a.m. Elton S, <eps2660@gmail.com> wrote:
>
> As a related question, what is the direction of flow through the radiator
> - up from the bottom or down from the top?
>
> Elton
>
> BJ7
>
>
>
> On Tue, Mar 29, 2022 at 11:44 AM Michael Salter <michaelsalter@gmail.com>
> wrote:
>
> As Gary points out, and far as I have been able to figure out, the bypass
> passage is open when the engine is cold, the idea being that by "short
> circuiting" the radiator the coolant in the heater and bypass passage wil=
l
> warm up more quickly and the heater will produce heat more quickly.
>
> We had a slew of the "shrouded " type thermostats that I bought when
> Smiths Canada closed down. The part number was 43570/28 and we used to se=
ll
> them to customers who reported overheating problems.
>
> I stopped promoting them as a potential solution to overheating issues
> after being taken to task by a customer who did an extensive study of the
> issue and proved, at least to my satisfaction, that they improved coolin=
g
> not one iota.
>
>
>
> M
>
>
>
> On Tue., Mar. 29, 2022, 10:47 a.m. Alan Seigrist, <healey.nut@gmail.com>
> wrote:
>
> I don't know if this has ever been answered before, but where does the
> little bypass port begin?
>
>
>
> What parts of the head does that bypass come in contact with?
>
> When do you want to cover the port with a sleeve (when coolant is hot or
> cold?)
>
>
>
> I ask because the old bellows style thermostat will cover the bypass port
> when the thermostat opens
>
> then I have another wax thermostat and the sleeve actually cover the
> bypass when it is cold, and doesn't cover it when the thermostat opens...=
.
> so it works exact opposite to the old bellows style thermostat.
>
>
>
> confused....
>
> Cheers,
>
>
>
> Alan
>
> _______________________________________________
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>
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>
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>
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>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation $12.75
>
> Archive: http://www.team.net/pipermail/healeys
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>
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<div dir=3D"auto">Would it be safe to say that closing off that if one was =
not using a thermostat closing off that passage in the water pump, with say=
a brass plug, would be as effective as the blanking sleeve?</div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue., Mar. 2=
9, 2022, 1:19 p.m. Harold Manifold, <<a href=3D"mailto:manifold@telus.ne=
t">manifold@telus.net</a>> wrote:<br></div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex=
"><div lang=3D"EN-US" link=3D"blue" vlink=3D"#954F72" style=3D"word-wrap:br=
eak-word"><div class=3D"m_-847906934875081105WordSection1"><p class=3D"MsoN=
ormal">The coolant bypass plays an important but problematic role in the He=
aley=E2=80=99s cooling system. When the thermostat is closed coolant return=
s to the water pump via the bypass. See the red circle on the attached pict=
ure. The bypass is important for three reasons: its allows the coolant in t=
he block to continue to circulate and come to a uniform temperature before =
the thermostat opens, it prevents hot spots that could develop from stagnan=
t coolant and it prevents the water pump from dead heading.</p><p class=3D"=
MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">The problematic p=
art is in the original design the bypass was closed by a sleeve on the bell=
ows type thermostat when the thermostat opened. The original Bellows type t=
hermostat used a volatile liquid and were not reliable and were not suitabl=
e for the 7 psi cooling system pressure. Wax type thermostats are much more=
reliable but they do not have a sleeve to close off the bypass. There may =
be some expensive wax type replicas of the original bellows type.</p><p cla=
ss=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">After looki=
ng at many options the best option for a reasonably priced wax type thermos=
tat with a sleeve to close off the bay pass is the modified Land Rover Seri=
es ll thermostat. If anyone would like to know about modifying the Landver =
thermostat let me know. It can be easily done.</p><p class=3D"MsoNormal"><u=
></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Harold<u></u><u></u></p><p cla=
ss=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div style=3D"border:none;border-t=
op:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class=3D"MsoNormal" st=
yle=3D"border:none;padding:0in"><b>From: </b><a href=3D"mailto:healeys@auto=
x.team.net" target=3D"_blank" rel=3D"noreferrer">Michael Salter via Healeys=
</a><br><b>Sent: </b>Tuesday, March 29, 2022 9:17 AM<br><b>To: </b><a href=
=3D"mailto:Healeys@autox.team.net"; target=3D"_blank" rel=3D"noreferrer">Hea=
ley list</a><br><b>Subject: </b>Re: [Healeys] Coolant bypass port in the he=
ad - 6-cyl</p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><p =
class=3D"MsoNormal">The coolant travels from the bottom of the radiator to =
the water pump into the block then from the block into the head then throug=
h the thermostat to the top of the radiator.</p><div><p class=3D"MsoNormal"=
><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">M</p></div></div=
><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNo=
rmal">On Tue., Mar. 29, 2022, 11:57 a.m. Elton S, <<a href=3D"mailto:eps=
2660@gmail.com" target=3D"_blank" rel=3D"noreferrer">eps2660@gmail.com</a>&=
gt; wrote:</p></div><blockquote style=3D"border:none;border-left:solid #ccc=
ccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><di=
v><p class=3D"MsoNormal">As a related question, what is the direction of fl=
ow through the radiator - up from the bottom or down from the top?</p><div>=
<p class=3D"MsoNormal">Elton=C2=A0=C2=A0</p></div><div><p class=3D"MsoNorma=
l">BJ7</p></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><=
div><p class=3D"MsoNormal">On Tue, Mar 29, 2022 at 11:44 AM Michael Salter =
<<a href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank" rel=3D"nor=
eferrer">michaelsalter@gmail.com</a>> wrote:</p></div><blockquote style=
=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;m=
argin-left:4.8pt;margin-right:0in"><div><p class=3D"MsoNormal">As Gary poin=
ts out, and far as I have been able to figure out, the bypass passage is op=
en when the engine is cold, the idea being that by "short circuiting&q=
uot; the radiator the coolant in the heater and bypass passage will warm up=
more quickly and the heater will produce heat more quickly.=C2=A0</p><div>=
<p class=3D"MsoNormal">We had a slew of the "shrouded " type ther=
mostats that I bought when Smiths Canada closed down. The part number was 4=
3570/28 and we used to sell them to customers who reported overheating prob=
lems.=C2=A0</p></div><div><p class=3D"MsoNormal">I stopped promoting them a=
s a potential solution to overheating issues after being taken to task by a=
customer who did an extensive study of the issue and proved, at least to m=
y satisfaction,=C2=A0 that they improved cooling not one iota.</p></div><di=
v><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"Mso=
Normal">M</p></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><di=
v><div><p class=3D"MsoNormal">On Tue., Mar. 29, 2022, 10:47 a.m. Alan Seigr=
ist, <<a href=3D"mailto:healey.nut@gmail.com"; target=3D"_blank" rel=3D"n=
oreferrer">healey.nut@gmail.com</a>> wrote:</p></div><blockquote style=
=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;m=
argin-left:4.8pt;margin-right:0in"><div><p class=3D"MsoNormal">I don't =
know if this has ever been answered before, but where does the little bypas=
s port begin?=C2=A0 =C2=A0</p><div><p class=3D"MsoNormal"><u></u>=C2=A0<u><=
/u></p></div><div><p class=3D"MsoNormal">What parts of the head does that b=
ypass come in contact with?=C2=A0<br><br>When do you want to cover the port=
with a sleeve (when coolant is hot or cold?)</p></div><div><p class=3D"Mso=
Normal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">I ask bec=
ause the old bellows style thermostat will cover the bypass port when the t=
hermostat opens<br><br>then I have another wax thermostat and the sleeve ac=
tually cover the bypass when it is cold, and doesn't cover it when the =
thermostat opens.... so it works exact opposite to the old bellows style th=
ermostat.</p></div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></di=
v><div><p class=3D"MsoNormal">confused....<br><br>Cheers,</p></div><div><p =
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNorma=
l">Alan</p></div></div><p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt=
">_______________________________________________<br>Support Team.Net <a hr=
ef=3D"http://www.team.net/donate.html"; target=3D"_blank" rel=3D"noreferrer"=
>http://www.team.net/donate.html</a><br>Suggested annual donation=C2=A0 $12=
.75<br><br>Archive: <a href=3D"http://www.team.net/pipermail/healeys"; targe=
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