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Hi Simon,
It is very unusual for a water pump to stop pumping, I had that happen once
on a TR7 but that is totally different type of pump. I would imagine that
it could happen if the impellor came loose on the shaft but then the seal
would almost certainly start leaking..IMHO forget the pump.
What you are describing sounds very like a thermostat failure. I haven't
studied the Smiths (retro) type thermostats closely but many earlier
designs of thermostats had a very bad design flaw in that they used to go
to the "closed" position when they failed.
I'm pretty sure that most modern thermostats are of the "fail safe" design
in that they fail in the open position.
The easiest test is just to remove the thermostat and see if the
overheating goes away.
To test the thermostat put it in a pot and bring the water temp up to the
boil ... you should be able to see the thermostat open before the water
boils.
Hope that helps..
M
On Wed, Sep 7, 2016 at 12:19 PM, Simon Lachlan <simon.lachlan@homecall.co.u=
k
> wrote:
> Hi,
>
> This isn=E2=80=99t the usual one ....=E2=80=9Dmy car always runs hot; wha=
t=E2=80=99s the cure?=E2=80=9D etc
>
> No, this is my very own original.....
>
> Background:-
>
> 1) The car, MkII BT7, has never had overheating issues before today.
>
> 2) It has a new, 12 month, modern design radiator.
>
> 3) It has the correct type(original design) Smiths sleeved
> thermostat. (5 years old +/-).
>
> 4) The waterpump was in the car when I bought the car +/- 25 yrs ago=
.
>
> Today=E2=80=99s symptoms:-
>
> 1) I took it out to the pub today and, on returning, I noticed that
> there was HEAT and then that the gauge was off the scale.
>
> 2) There was plenty of coolant in the rad and it didn=E2=80=99t seem=
overly
> hot.
>
> 3) I didn=E2=80=99t have much time, but I got the impression that th=
e rad
> was not blowing steam or making more of a =E2=80=9Ccooling-off noise=E2=
=80=9D than usual.
>
> 4) I also got the impression that the engine was hotter than the rad=
.
>
> Is this typical of a failed water pump?
>
> How can one differentiate between thermostat issues and waterpump issues?
>
>
>
> Any ideas?
>
> Simon
>
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--=20
*If you can't fix it with a hammer, you've got an electrical problem.*
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Hi Simon,<br></div><div class=3D"gmail_de=
fault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">It is=
very unusual for a water pump to stop pumping, I had that happen once on a=
TR7 but that is=C2=A0 totally different type of pump. I would imagine that=
it could happen if the impellor came loose on the shaft but then the seal =
would almost certainly start leaking..IMHO forget the pump.<br></div><div c=
lass=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-s=
ize:small">What you are describing sounds very like a thermostat failure. I=
haven't studied the Smiths (retro) type thermostats closely but many e=
arlier designs of thermostats had a very bad design flaw in that they used =
to go to the "closed" position when they failed. <br></div><div c=
lass=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-s=
ize:small">I'm pretty sure that most modern thermostats are of the &quo=
t;fail safe" design in that they fail in the open position.<br></div><=
div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;f=
ont-size:small">The easiest test is just to remove the thermostat and see i=
f the overheating goes away.<br></div><div class=3D"gmail_default" style=3D=
"font-family:comic sans ms,sans-serif;font-size:small">To test the thermost=
at put it in a pot and bring the water temp up to the boil ... you should b=
e able to see the thermostat open before the water boils.<br></div><div cla=
ss=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-siz=
e:small">Hope that helps..<br></div><div class=3D"gmail_default" style=3D"f=
ont-family:comic sans ms,sans-serif;font-size:small">M<br></div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small"><br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote">On Wed, Sep 7, 2016 at 12:19 PM, Simon Lachlan <span dir=3D"ltr"><=
<a href=3D"mailto:simon.lachlan@homecall.co.uk"; target=3D"_blank">simon.lac=
hlan@homecall.co.uk</a>></span> wrote:<br><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><div link=3D"blue" vlink=3D"purple" lang=3D"EN-GB"><div><p class=3D"MsoNor=
mal">Hi,<u></u><u></u></p><p class=3D"MsoNormal">This isn=E2=80=99t the usu=
al one ....=E2=80=9Dmy car always runs hot; what=E2=80=99s the cure?=E2=80=
=9D etc<u></u><u></u></p><p class=3D"MsoNormal">No, this is my very own ori=
ginal.....<u></u><u></u></p><p class=3D"MsoNormal">Background:-<u></u><u></=
u></p><p><u></u><span>1)<span style=3D"font:7.0pt "Times New Roman&quo=
t;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><u></u>The car, MkII BT7, =
has never had overheating issues before today.<u></u><u></u></p><p><u></u><=
span>2)<span style=3D"font:7.0pt "Times New Roman"">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 </span></span><u></u>It has a new, 12 month, modern desi=
gn radiator.<u></u><u></u></p><p><u></u><span>3)<span style=3D"font:7.0pt &=
quot;Times New Roman"">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><u=
></u>It has the correct type(original design) Smiths sleeved thermostat. (5=
years old +/-).<u></u><u></u></p><p><u></u><span>4)<span style=3D"font:7.0=
pt "Times New Roman"">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></spa=
n><u></u>The waterpump was in the car when I bought the car +/- 25 yrs ago.=
<u></u><u></u></p><p class=3D"MsoNormal">Today=E2=80=99s symptoms:- <u></u>=
<u></u></p><p><u></u><span>1)<span style=3D"font:7.0pt "Times New Roma=
n"">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><u></u>I took it out =
to the pub today and, on returning, I noticed that there was HEAT and then =
that the gauge was off the scale.<u></u><u></u></p><p><u></u><span>2)<span =
style=3D"font:7.0pt "Times New Roman"">=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 </span></span><u></u>There was plenty of coolant in the rad and it d=
idn=E2=80=99t seem overly hot.<u></u><u></u></p><p><u></u><span>3)<span sty=
le=3D"font:7.0pt "Times New Roman"">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span></span><u></u>I didn=E2=80=99t have much time, but I got the imp=
ression that the rad was not blowing steam or making more of a =E2=80=9Ccoo=
ling-off noise=E2=80=9D than usual.<u></u><u></u></p><p><u></u><span>4)<spa=
n style=3D"font:7.0pt "Times New Roman"">=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 </span></span><u></u>I also got the impression that the engine was h=
otter than the rad.<u></u><u></u></p><p class=3D"MsoNormal">Is this typical=
of a failed water pump?<u></u><u></u></p><p class=3D"MsoNormal">How can on=
e differentiate between thermostat issues and waterpump issues?<u></u><u></=
u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"=
>Any ideas?<span class=3D"HOEnZb"><font color=3D"#888888"><u></u><u></u></f=
ont></span></p><span class=3D"HOEnZb"><font color=3D"#888888"><p class=3D"M=
soNormal">Simon<u></u><u></u></p></font></span></div></div><br>____________=
__________________<wbr>_________________<br>
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>
<br>
<br></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail=
_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div d=
ir=3D"ltr"><i><font size=3D"2"><span style=3D"color:black">If you can't=
fix it with a hammer, you've got an electrical problem.</span></font><=
/i><br><br><div></div><div></div><div></div></div></div></div></div>
</div>
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