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Note the brass valve on the block is quite fragile and if it hasn't
been 'exercised' recently it's likely stuck and you stand a good
chance of snapping-off the small handle if you manhandle it. Moss
has the complete valve at $150, and replacement handles are
available. If it doesn't move easily I recommend soaking with a good
penetrant oil and carefully applying some heat, and work it
little-by-little (IIRC, the valve has the 'OFF' direction embossed
in the body). A 10/32 machine screw will work as a handle in a
pinch. IIRC, the valve has the 'OFF' direction embossed in the body
near the handle.<br>
<br>
Both valves on the 100s are large and robust, though still can get
stuck due to corrosion.<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/10/2023 8:32 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7LK5+wLB4oxvyfAYsCzTEH81TUCFtgxtDCMeHH6LymD3wA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">Turning off the small valve on the side of the
engine will only ensure that the heater is most definitely OFF
and will have no other detrimental effects.
<div dir="auto">The 100 has 2 such valves, one on the head and
one on the water pump and I always run with both turned off.
My car is usually in winter storage before it's cold enough to
need the heater.</div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon., Jul. 10, 2023, 10:41
a.m. Simon Lachlan 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:0 0 0
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<div link="#0563C1" vlink="#954F72" lang="EN-GB">
<div class="m_7399484926794662424WordSection1">
<p class="MsoNormal">I have a MkII BT7 with a normal
Smith’s heater. Normal insofar as it never seems to be
turned OFF 100% or ON 100%.</p>
<p class="MsoNormal">We are in our summer(?!) at the
moment and I was wondering about turning off the tap in
the hose from the block that leads into the cabin for
the heater.</p>
<p class="MsoNormal">Would the heater box and/or its valve
semi-dry out and fill with a mess of rusty crud?</p>
<p class="MsoNormal">Would the engine run hotter as there
was a little less water running through the system?</p>
<p class="MsoNormal">Or would I find myself basking in
cool luxury as I tootle off to the local boozer?</p>
<p class="MsoNormal">Or, most likely, none of the above,
especially the last one?!</p>
<p class="MsoNormal">I did take the car on quite a long
trip the other day (Le Mans Classic!!) and, once the
heat had soaked through the insulation, we were quite
warm….</p>
<p class="MsoNormal">The more I think about this, the less
I like the idea of turning that tap off…..</p>
<p class="MsoNormal">The tap does work, before you all
shout at once!</p>
<p class="MsoNormal">Simon</p>
</div>
</div>
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