[Healeys] OD switch wrench

[Bob Haskell]

 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.  
> 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 UNF  - 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 5:28 PM Bob Haskell <rchaskell at 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 at autox.team.net> On Behalf Of Bob
>>     Haskell
>>     > Sent: Thursday, August 27, 2026 5:26 AM
>>     > To: Healey List <healeys at 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
>>     >
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