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<p>Better not use the diodes. Use the old fashioned capacitors or
18V transils (or both) these are fitted over the points.</p>
<p>Sometimes SU pumps will not work after being rebuild. This is
often due to incorrect setting of the points of diaphragm, try
slightly reducing the given 0,9mm setting between spring blade and
top of the Bakelite bridge. The lower points are set to 2,3mm.
Sometimes it is caused by a stiff membrane. The original membrane
consists of three layers, two reinforced rubber and one Mylar
between the petrol and one of the rubber membranes. These membrane
may stick together after many years and thus rendering the
membrane rather stiff. Prise the membranes apart very carefully,
if the Mylar membrane splits the membrane is finished. Clean
thoroughly between the layers with brake cleaner, let dry
completely and apply a dusting of talcum powder sparingly. This
will make the diaphragm nice and supple again.</p>
<p>Kees Oudesluijs<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 31-5-2020 om 15:12 schreef
<a class="moz-txt-link-abbreviated" href="mailto:simon.lachlan@alexarevel.plus.com">simon.lachlan@alexarevel.plus.com</a>:<br>
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<p class="MsoNormal">About a week ago I posted a query which was
to the effect, “How long might one expect a set of (proper
Burlen) points for an SU pump to last?” <o:p></o:p></p>
<p class="MsoNormal">“How long is a piece of string?”, I hear
you say.<o:p></o:p></p>
<p class="MsoNormal">So, the reason for the original query was
this:- Not withstanding that they were not Taiwanese and that
I reckon they were correctly installed, I think that they wore
out rather quickly despite both sets being protected by Burlen
supplied diodes.<o:p></o:p></p>
<p class="MsoNormal">Replacing the points seemed, at first
glance, to be harder than I remembered from previous times……I
could get both sets running on the bench. With four plus one
extra holes after “throw-over(?)”. But, once in the car, one
pump would only work for a while….totally haphazard.<o:p></o:p></p>
<p class="MsoNormal">Eventually I turned to the wiring and
terminals at the “on, off, on” switch.:-<o:p></o:p></p>
<p class="MsoNormal">On….left hand half<o:p></o:p></p>
<p class="MsoNormal">Off….neither half<o:p></o:p></p>
<p class="MsoNormal">On….right hand half<o:p></o:p></p>
<p class="MsoNormal">The RHS terminals were intermittent. Ie
losing continuity hence cutting off power to the RHS.<o:p></o:p></p>
<p class="MsoNormal">QUESTION:- OK, assuming you’re still
reading, could the problems within the switch translate to
sparking and issues within the pumps’ points? And thus cause
them to wear out so quickly?<o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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