Mirek -
The only disadvantage with the sleeve thermostat is there is very
little clearance between the sleeve and the housing in which it sits.
I would take out the thermostat and very thouroughly clean the housing
with a wire brush - I suspect the sleeve is getting caught up from
time to time when it tries to open or close.
Alan
On 7/22/09, Mirek Sharp <m.g.sharp@sympatico.ca> wrote:
> Actually it is a heating problem. A few years ago I was having cooling
> problems and I consulted Norm Nock's book for advice. I ended up removing
> the
> rad and heater core and having them cleaned at a rad shop. I back-flushed
> the
> engine block, just with the garden hose. I also fitted an original type
> sleeve thermostat from British Car Specialists. I have recently had the
> temp
> gauge out and checked its accuracy with a lab thermometer and found it to be
> very accurate. After these changes the car did not overheat, but the
> temperature was always a bit sporadic, sometimes staying at around 160 and
> other times closer to 180. The car has always suffered from "hill boil" (as
> Michael Salter told me), the temperature needle swinging up to 212 whenever
> I
> am stopped, but never boiling over. I put this down to some irregular water
> circulation around the temp sensor when at idle. I am not worried about
> that
> - it has been doing it for 35 years.
>
> However, the irregular running temp is getting worse. Yesterday, driving on
> a
> cool morning, the temp settled in at around 170, but inexplicably dropped to
> around 120, where it stayed for the rest of the 2 hour trip. I can only
> think
> the thermostat is sticking open, but why would it function intermittently?
> Also, the thermostat is only a few years old and I do not drive the car
> regularly. I plan to pull the thermostat and test it, but thought I would
> plumb the depth of knowledge on the list first. I have no other
> explanation.
> Suggestions?
>
> Mirek
> 60 BT7
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--
Alan
'52 A90
'53 BN1
'64 BJ8
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