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From the Lucas Electrical Equipment Standards book (1965 edition), the
threads are 16 MM x 2 MM.
It gives the distance across the flats as 1-5/32".
Bob Haskell
Austin-Healey 3000 roadster registrar
On 9/3/26 17:06, Bob Haskell wrote:
> Alan,
>
> It's not listed on many Whitworth charts. 11/16 W is 1.200" AF.Â
> 1-5/32" is 1.156". 0.044" difference. Seems a bit sloppy, but not a
> lot of torque required.
>
> Thanks!
>
> Cheers,
> Bob Haskell
> Austin-Healey 3000 roadster registrar
>
> On 9/3/26 16:27, Alan Seigrist wrote:
>> That's because lucas never used UNFÂ - it will be a BA (for small
>> stuff) or Whitworth spanner size. This size corresponds to an 11/16"
>> Whitworth Spanner.
>>
>> On Tue, Sep 1, 2026 at 5:28â?¯PM Bob Haskell <rchaskell@earthlink.net>
>> wrote:
>>
>> I bought a thin open ended wrench off of ebay and did some
>> filing. Took
>> the switch off easily.
>>
>> So the next question - what's the thread size? Looks to be
>> 5/8"-13 - 55
>> degrees. Anyone know for sure?
>>
>> Cheers,
>>
>> Bob Haskell
>> Austin-Healey 3000 roadster registrar
>>
>>
>> On 8/27/26 18:44, JSARCH wrote:
>> > I I have uses this 1-3/16 wrench but I can't recall for certain
>> because it has been many years since I have had to remove the
>> switch. It is about 1/4" thick.
>> >
>> > Cheers,
>> > John
>> > '62 BT7
>> >
>> > -----Original Message-----
>> > From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Bob
>> Haskell
>> > Sent: Thursday, August 27, 2026 5:26 AM
>> > To: Healey List <healeys@autox.team.net>
>> > Subject: [Healeys] OD switch wrench
>> >
>> > Listers,
>> >
>> > Anyone know the wrench used to remove the 3rd/4th gear OD
>> switch from the center shift gearbox. Appears to be 1-5/32"
>> which is not a common size. Thinking of getting a thin 1-1/8"
>> open end wrench and opening it up a bit.
>> >
>> > Cheers,
>> >
>> > Bob Haskell
>> > Austin-Healey 3000 roadster registrar
>> >
>> > _______________________________________________
>> > Support Team.Net http://www.team.net/donate.html Suggested
>> annual donation $12.75
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>> http://autox.team.net/archive/healeys
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>> > Healeys@autox.team.net
>> > http://autox.team.net/mailman/listinfo/healeys
>> >
>> > Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/healeys/jmsdarch@sbcglobal.net
>> >
>>
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>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation $12.75
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>
>
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<font face="monospace">From the Lucas Electrical Equipment Standards
book (1965 edition), the threads are 16 MM x 2 MM.  <br>
<br>
It gives the distance across the flats as 1-5/32".</font>
<pre class="moz-signature" cols="72">Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
<br>
<div class="moz-cite-prefix">On 9/3/26 17:06, Bob Haskell wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1c802548-b6b3-4ef8-9837-c64509f1b6c0@earthlink.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<font face="monospace">Alan,<br>
<br>
It's not listed on many Whitworth charts. 11/16 W is 1.200"
AF. 1-5/32" is 1.156". 0.044" difference. Seems a bit sloppy,
but not a lot of torque required.<br>
<br>
Thanks!<br>
<br>
Cheers,</font>
<pre class="moz-signature" cols="72">Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
<br>
<div class="moz-cite-prefix">On 9/3/26 16:27, Alan Seigrist wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFBXTk+N6HQF2FFPXSu=4-MiSRK17wU_m-eXav4drEaNb9D+SQ@mail.gmail.com">
<meta http-equiv="content-type"
content="text/html; charset=UTF-8">
<div dir="ltr">That's because lucas never used UNFÂ - it will be
a BA (for small stuff) or Whitworth spanner size. This size
corresponds to an 11/16" Whitworth Spanner.</div>
<br>
<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Tue, Sep 1, 2026 at
5:28â?¯PM Bob Haskell <<a
href="mailto:rchaskell@earthlink.net";
moz-do-not-send="true"
class="moz-txt-link-freetext">rchaskell@earthlink.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">I
bought a thin open ended wrench off of ebay and did some
filing. Took <br>
the switch off easily.<br>
<br>
So the next question - what's the thread size? Looks to be
5/8"-13 - 55 <br>
degrees. Anyone know for sure?<br>
<br>
Cheers,<br>
<br>
Bob Haskell<br>
Austin-Healey 3000 roadster registrar<br>
<br>
<br>
On 8/27/26 18:44, JSARCH wrote:<br>
> I I have uses this 1-3/16 wrench but I can't recall for
certain because it has been many years since I have had to
remove the switch. It is about 1/4" thick.<br>
><br>
> Cheers,<br>
> John<br>
> '62 BT7<br>
><br>
> -----Original Message-----<br>
> From: Healeys <<a
href="mailto:healeys-bounces@autox.team.net";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">healeys-bounces@autox.team.net</a>>
On Behalf Of Bob Haskell<br>
> Sent: Thursday, August 27, 2026 5:26 AM<br>
> To: Healey List <<a
href="mailto:healeys@autox.team.net"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>><br>
> Subject: [Healeys] OD switch wrench<br>
><br>
> Listers,<br>
><br>
> Anyone know the wrench used to remove the 3rd/4th gear
OD switch from the center shift gearbox. Appears to be
1-5/32" which is not a common size. Thinking of getting a
thin 1-1/8" open end wrench and opening it up a bit.<br>
><br>
> Cheers,<br>
><br>
> Bob Haskell<br>
> Austin-Healey 3000 roadster registrar<br>
><br>
> _______________________________________________<br>
> Support Team.Net <a
href="http://www.team.net/donate.html"; rel="noreferrer"
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