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Years ago, someone--might have been BCS, but I'm not sure--was selling a
Robertshaw thermostat with a brass sleeve soldered to it (Robertshaw
thermostats have a center portion that moves up and down). The one I
bought was 160deg; I desoldered the sleeve and soldered it to a 180deg
Robertshaw. I bought one of the original, bellows-type from
Kees--whatever happened to him?--but never installed it; heard they were
the 'fail closed' type, which could turn a minor failure into a
catastrophe (still have it around somewhere).
https://flowkoolerwaterpumps.com/products/robertshaw-330-160-degree-thermostat
On 3/29/2022 6:35 PM, Alan Seigrist via Healeys wrote:
> Harold -
>
> Thank you, now I understand how the whole thing is supposed to work.Â
> The sleeve works to cut off the bypass so that hot water is not
> recycled into the system after it warms up. FWIW, this only applies to
> the 6 cyl, the 4 cyl doesn't have any sort of bypass.
>
> Yes, I think it would be great if you could share with us which
> thermostat to purchase and how to modify it.
>
> Best,
>
> Alan
>
> On Wed, Mar 30, 2022 at 1:28 AM Harold Manifold via Healeys
> <healeys@autox.team.net> wrote:
>
> The coolant bypass plays an important but problematic role in the
> Healeyâ??s cooling system. When the thermostat is closed coolant
> returns to the water pump via the bypass. See the red circle on
> the attached picture. The bypass 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 the
> 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
>
> *Sent: *Tuesday, March 29, 2022 9:17 AM
> *Subject: *Re: [Healeys] Coolant bypass port in the head - 6-cyl
>
> The coolant travels from the bottom of the radiator to the water
> pump into the block then from the block into the head then through
> the thermostat to 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 will 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 sell 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 cooling 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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Years ago, someone--might have been BCS, but I'm not sure--was
selling a Robertshaw thermostat with a brass sleeve soldered to it
(Robertshaw thermostats have a center portion that moves up and
down). The one I bought was 160deg; I desoldered the sleeve and
soldered it to a 180deg Robertshaw. I bought one of the original,
bellows-type from Kees--whatever happened to him?--but never
installed it; heard they were the 'fail closed' type, which could
turn a minor failure into a catastrophe (still have it around
somewhere).<br>
<br>
<a class="moz-txt-link-freetext"
href="https://flowkoolerwaterpumps.com/products/robertshaw-330-160-degree-thermostat";>https://flowkoolerwaterpumps.com/products/robertshaw-330-160-degree-thermostat</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 3/29/2022 6:35 PM, Alan Seigrist via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFBXTkJ=b+zOYKGSdnLM9qm7ac=kCj=7OY9NvsYGED9_rn4ckg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Harold -
<div><br>
</div>
<div>Thank you, now I understand how the whole thing is supposed
to work. The sleeve works to cut off the bypass so that hot
water is not recycled into the system after it warms up.Â
FWIW, this only applies to the 6 cyl, the 4 cyl doesn't have
any sort of bypass.<br>
<br>
Yes, I think it would be great if you could share with us
which thermostat to purchase and how to modify it.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Alan</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Mar 30, 2022 at 1:28
AM Harold Manifold via Healeys <<a
href="mailto:healeys@autox.team.net"; moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="overflow-wrap: break-word;" lang="EN-US">
<div class="gmail-m_1740681596236512560WordSection1">
<p class="MsoNormal">The coolant bypass plays an important
but problematic role in the Healeyâ??s cooling system.
When the thermostat is closed coolant returns to the
water pump via the bypass. See the red circle on the
attached picture. The bypass 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.</p>
<p class="MsoNormal">Â </p>
<p class="MsoNormal">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 the original bellows type.</p>
<p class="MsoNormal">Â </p>
<p class="MsoNormal">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.</p>
<p class="MsoNormal">Â </p>
<p class="MsoNormal">Harold</p>
<p class="MsoNormal">Â </p>
<div
style="border-right:none;border-bottom:none;border-left:none;border-top:1pt
solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal" style="border:none;padding:0in"><b>From:
</b><a href="mailto:healeys@autox.team.net";
target="_blank" moz-do-not-send="true">Michael
Salter via Healeys</a><br>
<b>Sent: </b>Tuesday, March 29, 2022 9:17 AM<br>
<b>To: </b><a href="mailto:Healeys@autox.team.net";
target="_blank" moz-do-not-send="true">Healey list</a><br>
<b>Subject: </b>Re: [Healeys] Coolant bypass port in
the head - 6-cyl</p>
</div>
<p class="MsoNormal">Â </p>
<div>
<p class="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 through the
thermostat to the top of the radiator.</p>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">M</p>
</div>
</div>
<p class="MsoNormal">Â </p>
<div>
<div>
<p class="MsoNormal">On Tue., Mar. 29, 2022, 11:57
a.m. Elton S, <<a href="mailto:eps2660@gmail.com";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">eps2660@gmail.com</a>>
wrote:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid rgb(204,204,204);padding:0in 0in 0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">As a related question, what is
the direction of flow through the radiator - up
from the bottom or down from the top?</p>
<div>
<p class="MsoNormal">Elton  </p>
</div>
<div>
<p class="MsoNormal">BJ7</p>
</div>
</div>
<p class="MsoNormal">Â </p>
<div>
<div>
<p class="MsoNormal">On Tue, Mar 29, 2022 at 11:44
AM Michael Salter <<a
href="mailto:michaelsalter@gmail.com";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">michaelsalter@gmail.com</a>>
wrote:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid rgb(204,204,204);padding:0in 0in 0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">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 will warm up more quickly and the
heater will produce heat more quickly. </p>
<div>
<p class="MsoNormal">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 sell them
to customers who reported overheating
problems. </p>
</div>
<div>
<p class="MsoNormal">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 cooling
not one iota.</p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">M</p>
</div>
</div>
<p class="MsoNormal">Â </p>
<div>
<div>
<p class="MsoNormal">On Tue., Mar. 29, 2022,
10:47 a.m. Alan Seigrist, <<a
href="mailto:healey.nut@gmail.com";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">healey.nut@gmail.com</a>>
wrote:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid rgb(204,204,204);padding:0in 0in 0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">I don't know if this
has ever been answered before, but where
does the little bypass port begin?  </p>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">What parts of the
head does that bypass come in contact
with? <br>
<br>
When do you want to cover the port with
a sleeve (when coolant is hot or cold?)</p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">I ask because the old
bellows style thermostat will cover the
bypass port when the thermostat opens<br>
<br>
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.</p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">confused....<br>
<br>
Cheers,</p>
</div>
<div>
<p class="MsoNormal">Â </p>
</div>
<div>
<p class="MsoNormal">Alan</p>
</div>
</div>
<p class="MsoNormal"
style="margin-bottom:12pt">_______________________________________________<br>
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<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
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