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Patrick,
Thinking out loud here. The hydraulic pump in the overdrive is always
supplying pressure. When you turn the OD switch to Overdrive the
solenoid moves a linkage in the overdrive to open the hydraulic valve.Â
When you flip the OD switch to Normal, the throttle switch keeps the
solenoid energized so the hydraulic valve is still open. When you press
on the accelerator pedal, the solenoid de-energizes, the hydraulic valve
closes and the OD goes to direct.
It seems like the hydraulic valve is moving since the OD goes to direct
when you press on the throttle. So, the solenoid would have to be
energized to move the valve again.
When you first start out, with the OD in Normal, it doesn't attempt to
go into Overdrive, right?
When I am coming to a stop with the car in Overdrive, I flip the switch
to Normal, put the gearbox in neutral, and blip the throttle. I then
move the gear shift lever left and right. If I hear the solenoid
engaging when I'm next to 3rd/4th and disengaging next to 1st/2nd, I
know the OD solenoid circuit is still energized and blip the throttle
again.
If you put the gearbox in neutral, do you hear the solenoid when you
move the gear shift lever left/right?
Cheers,
Bob Haskell
Austin-Healey 3000 roadster registrar
On 8/24/25 05:27, Patrick and Caroline Quinn wrote:
>
> Gâ??day
>
> Thank you to those who responded concerning how best to adjust the
> overdrive throttle switch.
>
> Well I did what was suggested and have the overdrive cutting out when
> the accelerator is pressed about a fifth of the throttle opening.
>
> I wish that was as simple as that, because whatâ??s happening next is
> confusing.
>
> Whatâ??s happening is that I could be driving along in top overdrive.
> Flick the switch to â??Normalâ?? and it behaves as it should, staying in
> overdrive. Press down on the accelerator and it changes down to direct
> top. So far so good.
>
> Ease up on the accelerator and does it stay in direct top? No, it goes
> back into overdrive even though the dash switch is still on â??Normalâ??.
>
> Any ideas?
>
> Hoo Roo
>
> Patrick Quinn
>
> Blue Mountains, Australia
>
>
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<p>Patrick,</p>
<p>Thinking out loud here. The hydraulic pump in the overdrive is
always supplying pressure. When you turn the OD switch to
Overdrive the solenoid moves a linkage in the overdrive to open
the hydraulic valve. When you flip the OD switch to Normal, the
throttle switch keeps the solenoid energized so the hydraulic
valve is still open. When you press on the accelerator pedal, the
solenoid de-energizes, the hydraulic valve closes and the OD goes
to direct.</p>
<p>It seems like the hydraulic valve is moving since the OD goes to
direct when you press on the throttle. So, the solenoid would
have to be energized to move the valve again.<br>
</p>
<p>When you first start out, with the OD in Normal, it doesn't
attempt to go into Overdrive, right?</p>
<p>When I am coming to a stop with the car in Overdrive, I flip the
switch to Normal, put the gearbox in neutral, and blip the
throttle. I then move the gear shift lever left and right. If I
hear the solenoid engaging when I'm next to 3rd/4th and
disengaging next to 1st/2nd, I know the OD solenoid circuit is
still energized and blip the throttle again. <br>
</p>
<p>If you put the gearbox in neutral, do you hear the solenoid when
you move the gear shift lever left/right?</p>
<p>Cheers,<br>
</p>
<pre class="moz-signature" cols="72">Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
<div class="moz-cite-prefix">On 8/24/25 05:27, Patrick and Caroline
Quinn wrote:<br>
</div>
<blockquote type="cite"
cite="mid:OSQPR01MB64306E11B1FCE0E4E32596838C3FA@OSQPR01MB6430.apcprd01.prod.exchangelabs.com">
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<p class="MsoNormal">Gâ??day<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Thank you to those who responded concerning
how best to adjust the overdrive throttle switch.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Well I did what was suggested and have the
overdrive cutting out when the accelerator is pressed about a
fifth of the throttle opening.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">I wish that was as simple as that, because
whatâ??s happening next is confusing.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Whatâ??s happening is that I could be driving
along in top overdrive. Flick the switch to â??Normalâ?? and it
behaves as it should, staying in overdrive. Press down on the
accelerator and it changes down to direct top. So far so good.
<o:p></o:p></p>
<p class="MsoNormal">Ease up on the accelerator and does it stay
in direct top? No, it goes back into overdrive even though the
dash switch is still on â??Normalâ??.
<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Any ideas?<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Hoo Roo<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Patrick Quinn<o:p></o:p></p>
<p class="MsoNormal">Blue Mountains, Australia<o:p></o:p></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre wrap=""
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