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Harold -
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. 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 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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>
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> Suggested annual donation $12.75
>
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>
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Harold -<div><br></div><div>Thank you, now I understand ho=
w the whole thing is supposed to work.=C2=A0 The sleeve works to cut off th=
e bypass so that hot water is not recycled into the system after it warms u=
p.=C2=A0 FWIW, this only applies to the 6 cyl, the 4 cyl doesn't have a=
ny 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=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 30, 2022 at =
1:28 AM Harold Manifold via Healeys <<a href=3D"mailto:healeys@autox.tea=
m.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div lang=3D"EN-US" style=3D"overflow-wrap: br=
eak-word;"><div class=3D"gmail-m_1740681596236512560WordSection1"><p class=
=3D"MsoNormal">The coolant bypass plays an important but problematic role i=
n the Healey=E2=80=99s cooling system. When the thermostat is closed coolan=
t returns to the water pump via the bypass. See the red circle on the attac=
hed picture. The bypass is important for three reasons: its allows the cool=
ant 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 c=
lass=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">The probl=
ematic part is in the original design the bypass was closed by a sleeve on =
the bellows type thermostat when the thermostat opened. The original Bellow=
s 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 m=
uch more reliable but they do not have a sleeve to close off the bypass. Th=
ere may be some expensive wax type replicas of the original bellows type.</=
p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Aft=
er 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 Ro=
ver 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=3D"MsoNo=
rmal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Harold<u></u><u></u></=
p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><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" style=3D"border:none;paddi=
ng:0in"><b>From: </b><a href=3D"mailto:healeys@autox.team.net"; target=3D"_b=
lank">Michael Salter via Healeys</a><br><b>Sent: </b>Tuesday, March 29, 202=
2 9:17 AM<br><b>To: </b><a href=3D"mailto:Healeys@autox.team.net"; target=3D=
"_blank">Healey list</a><br><b>Subject: </b>Re: [Healeys] Coolant bypass po=
rt in the head - 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 through 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"MsoNormal">On Tue., Mar. 29, 2022, 11:57 a.m. Elton S, <<a href=
=3D"mailto:eps2660@gmail.com"; target=3D"_blank">eps2660@gmail.com</a>> w=
rote:</p></div><blockquote style=3D"border-top:none;border-right:none;borde=
r-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6p=
t;margin-left:4.8pt;margin-right:0in"><div><p class=3D"MsoNormal">As a rela=
ted question, what is the direction of flow 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"MsoNormal">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:michaelsalte=
r@gmail.com" target=3D"_blank">michaelsalter@gmail.com</a>> wrote:</p></=
div><blockquote style=3D"border-top:none;border-right:none;border-bottom:no=
ne;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-le=
ft:4.8pt;margin-right:0in"><div><p class=3D"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 qu=
ickly and the heater will produce heat more quickly.=C2=A0</p><div><p class=
=3D"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.=C2=
=A0</p></div><div><p class=3D"MsoNormal">I stopped promoting them as a pote=
ntial solution to overheating issues after being taken to task by a custome=
r who did an extensive study of the issue and proved, at least to my satisf=
action,=C2=A0 that they improved cooling not one iota.</p></div><div><p cla=
ss=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"MsoNormal">On Tue., Mar. 29, 2022, 10:47 a.m. Alan Seigrist, <=
;<a href=3D"mailto:healey.nut@gmail.com"; target=3D"_blank">healey.nut@gmail=
.com</a>> wrote:</p></div><blockquote style=3D"border-top:none;border-ri=
ght: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=3D"MsoNor=
mal">I don't know if this has ever been answered before, but where does=
the little bypass 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 bypass 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><di=
v><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"Mso=
Normal">I ask because the old bellows style thermostat will cover the bypas=
s 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 c=
over it when the thermostat opens.... so it works exact opposite to the old=
bellows style thermostat.</p></div><div><p class=3D"MsoNormal"><u></u>=C2=
=A0<u></u></p></div><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"MsoNormal">Alan</p></div></div><p class=3D"MsoNormal" style=3D"ma=
rgin-bottom:12pt">_______________________________________________<br>Suppor=
t Team.Net <a href=3D"http://www.team.net/donate.html"; target=3D"_blank">ht=
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