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Further thoughts.
As well as interfacing at the front of the gearbox under the remote
control unit the shafts also interface aft of the gearbox proper in the
extension (to which is attached the overdrive if fitted). The rear of
the shafts have curved fingers at right-angles to the shafts that have
to pass over each other as each shaft is moved fore and aft. They, the
pieces at the front with the interlock plate, and the forks that shift
the hubs all have screws going into holes in the shafts with locknuts to
keep things in the correct relative positions. The ones at the front
and the back are locked with wire, but for some reason (two gearboxes)
the forks don't seem to have the wire. It's the fork that sets the
rotational position of the each shaft, and hence the relationship
between the interlock components at the front and the fingers at the
rear. If one of those has come loose then that shaft could turn and
prevent the other two from moving as well as itself. The forks are
visible by removing the side cover, so you might get lucky. Several
pictures of these areas and others taken during a dismantle here
http://www.mgb-stuff.org.uk/geardis.htm
PaulH.
On 23/09/2024 23:09, S.Carr wrote:
>
> My â??71 B/GT has suddenly developed a gearbox problemâ??intermittently it
> will not go into _any_gear, whether the engine is running or not. A
> few minutes later it will work normally, then later refuse to shift
> again. Any idea where we should look for the cause? We assume the
> side plate will have to come off. We need to fix the problem, as I
> want to put the car up for sale before winter sets in----
>
> Sarah Carr
>
> â??71 B/GT in PA
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows
>
>
> _______________________________________________
>
> Mgs@autox.team.net
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<p>Further thoughts.</p>
<p>As well as interfacing at the front of the gearbox under the
remote control unit the shafts also interface aft of the gearbox
proper in the extension (to which is attached the overdrive if
fitted). The rear of the shafts have curved fingers at
right-angles to the shafts that have to pass over each other as
each shaft is moved fore and aft. They, the pieces at the front
with the interlock plate, and the forks that shift the hubs all
have screws going into holes in the shafts with locknuts to keep
things in the correct relative positions. The ones at the front
and the back are locked with wire, but for some reason (two
gearboxes) the forks don't seem to have the wire. It's the fork
that sets the rotational position of the each shaft, and hence the
relationship between the interlock components at the front and the
fingers at the rear. If one of those has come loose then that
shaft could turn and prevent the other two from moving as well as
itself. The forks are visible by removing the side cover, so you
might get lucky. Several pictures of these areas and others taken
during a dismantle here <a class="moz-txt-link-freetext"
href="http://www.mgb-stuff.org.uk/geardis.htm";>http://www.mgb-stuff.org.uk/geardis.htm</a></p>
<p>PaulH.<br>
</p>
<div class="moz-cite-prefix">On 23/09/2024 23:09, S.Carr wrote:<br>
</div>
<blockquote type="cite"
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<div class="WordSection1">
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt">My â??71 B/GT has suddenly
developed a gearbox problemâ??intermittently it will not go
into </span></span><span class="DefaultFontHxMailStyle"><u><span
style="font-size:12.0pt">any</span></u></span><span
class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt"> gear, whether the engine is
running or not. A few minutes later it will work
normally, then later refuse to shift again. Any idea
where we should look for the cause? We assume the side
plate will have to come off. We need to fix the problem,
as I want to put the car up for sale before winter sets
in----<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt">Sarah Carr<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt">â??71 B/GT in
PA<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt"><o:p>Â </o:p></span></span></p>
<p class="MsoNormal">Sent from <a
href="https://go.microsoft.com/fwlink/?LinkId=550986";
moz-do-not-send="true">Mail</a> for Windows</p>
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt"><o:p>Â </o:p></span></span></p>
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<pre class="moz-quote-pre"
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