--===============1951720726123960781==
--000000000000a607c705db66cc6d
Content-Transfer-Encoding: quoted-printable
Alan, I purchased some years ago, modern style, from BCS Norman Nock, work
well.
I would assume they still have them
On Wed, Mar 30, 2022 at 11:37 AM Alan Seigrist via Healeys <
healeys@autox.team.net> wrote:
> 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 thermosta=
t
> 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 r=
eturns to
>> the water pump via the bypass. See the red circle on the attached pictur=
e.
>> 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. Wa=
x
>> 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 t=
he
>> original bellows type.
>>
>>
>>
>> After looking at many options the best option for a reasonably priced wa=
x
>> 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
>> 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 radiato=
r
>> - 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 bypas=
s
>> 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 wi=
ll
>> 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 s=
ell
>> 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 th=
e
>> issue and proved, at least to my satisfaction, that they improved cooli=
ng
>> 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 por=
t
>> 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
>>
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation $12.75
>>
>> Archive: http://www.team.net/pipermail/healeys
>> http://autox.team.net/archive/healeys
>>
>> Healeys@autox.team.net
>> http://autox.team.net/mailman/listinfo/healeys
>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com
>>
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation $12.75
>>
>> Archive: http://www.team.net/pipermail/healeys
>> http://autox.team.net/archive/healeys
>>
>> Healeys@autox.team.net
>> http://autox.team.net/mailman/listinfo/healeys
>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/healeys/eps2660@gmail.com
>>
>>
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation $12.75
>>
>> Archive: http://www.team.net/pipermail/healeys
>> http://autox.team.net/archive/healeys
>>
>> Healeys@autox.team.net
>> http://autox.team.net/mailman/listinfo/healeys
>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/healeys/healey.nut@gmail.com
>>
>> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation $12.75
>
> Archive: http://www.team.net/pipermail/healeys
> http://autox.team.net/archive/healeys
>
> Healeys@autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/jtkarowe@gmail.com
>
>
--000000000000a607c705db66cc6d
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Alan, I purchased some years ago, modern style, from BCS N=
orman Nock, work well.<div>I would assume they still have them</div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed,=
Mar 30, 2022 at 11:37 AM Alan Seigrist via Healeys <<a href=3D"mailto:h=
ealeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:=
1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Harold -<div>=
<br></div><div>Thank you, now I understand how the whole thing is supposed =
to work.=C2=A0 The sleeve works to cut off the bypass so that hot water is =
not recycled into the system after it warms up.=C2=A0 FWIW, this only appli=
es 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 p=
urchase 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 He=
aleys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">heale=
ys@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(204,204,204);p=
adding-left:1ex"><div lang=3D"EN-US"><div><p class=3D"MsoNormal">The coolan=
t bypass plays an important but problematic role in the Healey=E2=80=99s co=
oling system. When the thermostat is closed coolant returns to the water pu=
mp via the bypass. See the red circle on the attached picture. The bypass i=
s important for three reasons: its allows the coolant in the block to conti=
nue to circulate and come to a uniform temperature before the thermostat op=
ens, it prevents hot spots that could develop from stagnant 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 part is in the ori=
ginal design the bypass was closed by a sleeve on the bellows type thermost=
at 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 c=
ooling system pressure. Wax type thermostats are much more reliable but the=
y 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=3D"MsoNormal">=
<u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">After looking at many option=
s 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=3D"MsoNormal"><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;padding:0in"><b>From: </b><a h=
ref=3D"mailto:healeys@autox.team.net"; target=3D"_blank">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">Healey list</a><=
br><b>Subject: </b>Re: [Healeys] Coolant bypass port in the head - 6-cyl</p=
></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><p class=3D"MsoN=
ormal">The coolant travels from the bottom of the radiator to the water pum=
p into the block then from the block into the head then through the thermos=
tat 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@gmai=
l.com" target=3D"_blank">eps2660@gmail.com</a>> wrote:</p></div><blockqu=
ote style=3D"border-top:none;border-right:none;border-bottom:none;border-le=
ft:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;mar=
gin-right:0in"><div><p class=3D"MsoNormal">As a related question, what is t=
he 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 11:4=
4 AM Michael Salter <<a href=3D"mailto:michaelsalter@gmail.com"; target=
=3D"_blank">michaelsalter@gmail.com</a>> wrote:</p></div><blockquote sty=
le=3D"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-rig=
ht:0in"><div><p class=3D"MsoNormal">As Gary points out, and far as I have b=
een able to figure out, the bypass passage is open when the engine is cold,=
the idea being that by "short circuiting" the radiator the coola=
nt in the heater and bypass passage will warm up more quickly and the heate=
r will produce heat more quickly.=C2=A0</p><div><p class=3D"MsoNormal">We h=
ad 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 potential solution to o=
verheating issues after being taken to task by a customer who did an extens=
ive study of the issue and proved, at least to my satisfaction,=C2=A0 that =
they improved cooling not one iota.</p></div><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"MsoNorma=
l">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-right:none;border-bot=
tom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;mar=
gin-left:4.8pt;margin-right:0in"><div><p class=3D"MsoNormal">I don't kn=
ow 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 byp=
ass come in contact with?=C2=A0<br><br>When do you want to cover the port w=
ith a sleeve (when coolant is hot or cold?)</p></div><div><p class=3D"MsoNo=
rmal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">I ask becau=
se the old bellows style thermostat will cover the bypass port when the the=
rmostat opens<br><br>then I have another wax thermostat and the sleeve actu=
ally cover the bypass when it is cold, and doesn't cover it when the th=
ermostat opens.... so it works exact opposite to the old bellows style ther=
mostat.</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 cl=
ass=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"margin-bottom:12pt">__=
_____________________________________________<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 annual donation=C2=A0 $12.75<br><br>Archive: <=
a href=3D"http://www.team.net/pipermail/healeys"; target=3D"_blank">http://w=
ww.team.net/pipermail/healeys</a> <a href=3D"http://autox.team.net/archive/=
healeys" target=3D"_blank">http://autox.team.net/archive/healeys</a><br><br=
><a href=3D"mailto:Healeys@autox.team.net"; target=3D"_blank">Healeys@autox.=
team.net</a><br><a href=3D"http://autox.team.net/mailman/listinfo/healeys"; =
target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br=
>Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/options/heale=
ys/michaelsalter@gmail.com" target=3D"_blank">http://autox.team.net/mailman=
/options/healeys/michaelsalter@gmail.com</a></p></blockquote></div></blockq=
uote></div></blockquote></div><p class=3D"MsoNormal" style=3D"margin-right:=
0in;margin-bottom:12pt;margin-left:9.6pt">_________________________________=
______________<br>Support Team.Net <a href=3D"http://www.team.net/donate.ht=
ml" target=3D"_blank">http://www.team.net/donate.html</a><br>Suggested annu=
al donation=C2=A0 $12.75<br><br>Archive: <a href=3D"http://www.team.net/pip=
ermail/healeys" target=3D"_blank">http://www.team.net/pipermail/healeys</a>=
<a href=3D"http://autox.team.net/archive/healeys"; target=3D"_blank">http:/=
/autox.team.net/archive/healeys</a><br><br><a href=3D"mailto:Healeys@autox.=
team.net" target=3D"_blank">Healeys@autox.team.net</a><br><a href=3D"http:/=
/autox.team.net/mailman/listinfo/healeys" target=3D"_blank">http://autox.te=
am.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href=3D"h=
ttp://autox.team.net/mailman/options/healeys/eps2660@gmail.com" target=3D"_=
blank">http://autox.team.net/mailman/options/healeys/eps2660@gmail.com</a><=
/p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div></div>_____________=
__________________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/pipermail/healeys"; rel=3D"noreferre=
r" target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a href=3D"h=
ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
http://autox.team.net/archive/healeys</a><br>
<br>
<a href=3D"mailto:Healeys@autox.team.net"; target=3D"_blank">Healeys@autox.t=
eam.net</a><br>
<a href=3D"http://autox.team.net/mailman/listinfo/healeys"; rel=3D"noreferre=
r" target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/healey.nut@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.t=
eam.net/mailman/options/healeys/healey.nut@gmail.com</a><br>
<br>
</blockquote></div>
_______________________________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/pipermail/healeys"; rel=3D"noreferre=
r" target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a href=3D"h=
ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
http://autox.team.net/archive/healeys</a><br>
<br>
<a href=3D"mailto:Healeys@autox.team.net"; target=3D"_blank">Healeys@autox.t=
eam.net</a><br>
<a href=3D"http://autox.team.net/mailman/listinfo/healeys"; rel=3D"noreferre=
r" target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/jtkarowe@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.tea=
m.net/mailman/options/healeys/jtkarowe@gmail.com</a><br>
<br>
</blockquote></div>
--000000000000a607c705db66cc6d--
--===============1951720726123960781==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Archive: http://www.team.net/pipermail/healeys
http://autox.team.net/archive/healeys
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============1951720726123960781==--
|