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Yes, there are crap solenoids in the wild (side note: there's also
rumors that bad actors were buying surplus Lucas boxes and putting
Chinese crap in them).
Years ago, our own Michael Salter acquired some legit Lucas/quality
solenoids and offered them for sale. For once, I was smart enough to
grab one even though I didn't need it at the time, but did a few years
later. Since the plunger shouldn't wear, and the windings should last a
long time the most likely failure point is, well, the points (there are
two in the solenoids: a momentary 'pull up' set and a 'sustain' set--why
the circuit should have a slow blow fuse). I don't know if they have any
internal arc protection, but you could probably rig something external,
though given the cycles the solenoid experiences it shouldn't really be
an issue. Same issue is in points ignition and our beloved S.U. fuel
pumps: arcing across the points when a coil field collapses causes
erosion of the points due to metal transfer. Capacitors ('condensers')
and diodes can mitigate erosion but, eventually, the points will pit and
possibly stick.
On 9/23/2024 1:48 AM, Simon Lachlan via Healeys wrote:
>
> The other day my overdrive stopped working. (For the nth time. Toyota
> 5 speed please Santa).
>
> Anyhow, it failed what I called the â??click testâ?? so I was 99%sure that
> the fault was electric.First off, itâ??s fused so the wiring was
> unlikely to be fried and the fuse had not blownThe relay passed its
> bench test and thethrottle switch was OK.So, I was pretty sure it was
> the solenoidâ?¦..maybe the gearstick switch but didnâ??t seem likely.
>
> So, I dismantled down to the solenoid. Not too serious in a BT7and
> much helped by having tunnel cover held down by stainless steelscrews
> into rivnuts.
>
> Put a test lampin lieu of the solenoid. Lamp lit up when OD was â??Onâ??
> and stick was to the right. So, the problem WAS in the solenoid and
> final proof was its replacement by a spare which solved the problem.
>
> I took the rubber cover off the top and there was no evidence offrying
> etc. All looked good.The solenoid was dead as a dodoâ?¦.putting it
> across a spare 12v battery didnâ??t induce a soundor a twitch.
>
> Now, the question(s)��are there dud ones out there? Why/howdid it fail?
>
> Just curious��.
>
> Simon
>
>
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Yes, there are crap solenoids in the wild (side note: there's also
rumors that bad actors were buying surplus Lucas boxes and putting
Chinese crap in them).<br>
<br>
Years ago, our own Michael Salter acquired some legit Lucas/quality
solenoids and offered them for sale. For once, I was smart enough to
grab one even though I didn't need it at the time, but did a few
years later. Since the plunger shouldn't wear, and the windings
should last a long time the most likely failure point is, well, the
points (there are two in the solenoids: a momentary 'pull up' set
and a 'sustain' set--why the circuit should have a slow blow fuse).
I don't know if they have any internal arc protection, but you could
probably rig something external, though given the cycles the
solenoid experiences it shouldn't really be an issue. Same issue is
in points ignition and our beloved S.U. fuel pumps: arcing across
the points when a coil field collapses causes erosion of the points
due to metal transfer. Capacitors ('condensers') and diodes can
mitigate erosion but, eventually, the points will pit and possibly
stick.<br>
<br>
<br>
<div class="moz-cite-prefix">On 9/23/2024 1:48 AM, Simon Lachlan via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:000001db0d95$6bfe7cd0$43fb7670$@alexarevel.plus.com">
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<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">The
other day my overdrive stopped working. (For the nth time.
Toyota 5 sp</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Times New Roman">eed please Santa).</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Anyhow,
it failed what I called the â??click testâ?? so I was
99%</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Times New Roman"> sure that the fault
was electric.</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"> <font
face="Times New Roman">First off, itâ??s fused so the wiring
was unlikely to be fried and the fuse had not
blown</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"> <font face="Times New Roman">The relay passed
its bench test and the</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"> <font
face="Times New Roman">throttle switch was OK.</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"> <font face="Times New Roman">So, I was
pre</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Times New Roman">tty sure it was the
solenoidâ?¦..maybe the gearstick switch but didnâ??t seem
likely.</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">So, I
di</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Times New Roman">smantled down to the
solenoid. Not too serious in a BT7</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"> <font face="Times New Roman">and much helped by
having tunnel cover held down by stainless steel</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"> <font face="Times New Roman">screws into
rivnuts.</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Put a
test lamp</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"> <font
face="Times New Roman">in lieu of the solenoid. Lamp lit up
when OD was â??Onâ?? and stick was to the right</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Times New Roman">. So, the problem
WAS in the solenoid and final proof was its replacement by a
spare which solved the problem.</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">I
took the rubber cover off the top and there was no evidence
of</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Times New Roman"> frying etc. All
looked good.</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Times New Roman"> The solenoid was dead as a
dodoâ?¦.putting it across a spare 12v batter</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Times New Roman">y didnâ??t induce a
sound</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Times New Roman"> or a twitch</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Times New Roman">.</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Now,
the quest</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Times New Roman">ion(s)��are there dud ones out there?
Why</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Times New Roman">/how</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Times New Roman"> did it fail?</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"> </span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Just
curious��.</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New
Roman">Simon</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span></p>
<br>
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