Indicator switch/horn push -Special Sports

terryfrombury
Posts: 56
Joined: Fri Feb 12, 2016 10:25 pm
Location: Cheshire, UK

Indicator switch/horn push -Special Sports

Post by terryfrombury » Wed Dec 06, 2017 5:32 pm

Evening everyone,
I`m using the winter months to try to sort out the last couple of teething problems on the Special Sports. One of these problems is the failure of the semaphore indicator switch to self-cancel. It turns out that there is a bit too much wear in the slip ring which engages with the steering wheel, turns with it around the static switch unit, and pushes the little pieces which return the indicator lever to the central position. The Lucas part number is 323182.
I don`t suppose anyone has a less worn ring - or complete centre unit - do they?
Many ta`s
Terry from Bury

Db n j
Posts: 101
Joined: Sun Mar 13, 2016 8:55 am

Re: Indicator switch/horn push -Special Sports

Post by Db n j » Wed Dec 06, 2017 8:41 pm

Terry, good to see you have nearly finished ! Goodness knows when we will meet up with our cars, especially since I now have to refit the cylinder head on the Duke.

As for your indicator switch, I don't think I can help. I did wonder if it's the same internal but as the conquest. (I see quite a lot of db18s with the later unit fitted. This may be easier to source)

Regards

clevitt
Posts: 39
Joined: Wed May 18, 2016 1:02 pm
Location: West Hertfordshire

Re: Indicator switch/horn push -Special Sports

Post by clevitt » Wed Dec 06, 2017 8:56 pm

Hi Terry,
Is this the part you are after?. Out of interest, where do see the wear that is causing the problem?
My own experience is that I am lucky to achieve a self cancellation success rate of 50%, right hand turns being better than left hand turns. I put this down to the limits of the technology of that time , as presumably the 1950s were early days for the use of self cancelling indicators in British cars?
image.jpeg
image.jpeg
Chris

qantasqf1
Posts: 60
Joined: Mon Mar 07, 2016 10:13 pm

Re: Indicator switch/horn push -Special Sports

Post by qantasqf1 » Thu Dec 07, 2017 7:19 am

Terry, this cancelling ring should be securely fastened to the inner diameter of the steering wheel yoke by a chrome headed screw which threads through the yoke and engages a slotted nut fitted to the cancelling ring, the ring being slotted to allow for minor adjustment to centralise it. Given this, the cancelling ring shouldn’t slip at all, being positively retained, and although I’m loath to suggest is the retaining screw missing? FWIW sometimes the 2 brass (or aluminium) pawls of the trafficator switch itself can wear so the cam on the cancelling ring won’t trip it.
Steve

Simon Hyslop
Posts: 190
Joined: Wed May 04, 2016 3:30 pm

Re: Indicator switch/horn push -Special Sports

Post by Simon Hyslop » Thu Dec 07, 2017 11:01 am

I would hazard a guess that 1935 was the first year the self cancelling mechanical indicator switch came out. Austins I've had from 1935 had it and that's as early as I remember. At least one club I know of is looking at the possibility of 3D printing some of the trafficator switch components but again, if my memory is correct, the metal (some sort of pot metal or mazak) in the pre war units may, and I stress the" may" , be of somewhat better quality than the post war ones.

I wonder if a piece of shim steel, cut to size and araldited inside, might be of use ?

terryfrombury
Posts: 56
Joined: Fri Feb 12, 2016 10:25 pm
Location: Cheshire, UK

Re: Indicator switch/horn push -Special Sports

Post by terryfrombury » Thu Dec 07, 2017 1:57 pm

DSC_0094.JPG
DSC_0093.JPG
Bless Joe Lucas, though - you`ll see just how different this piece is from the one Chris posted. This piece is a die cast zinc item which is not screwed to the steering wheel boss. The notch on the outer edge (at the bottom of the lower photo) engages with a lug in the steering wheel boss.
The part which is worn is the shoulder within the piece, and I think in the upper picture you can just see how shiny it is where it is worn away.
Cheers
Terry

Phillmore
Posts: 527
Joined: Sat Feb 13, 2016 1:25 pm
Location: Worcestershire Herefordshire border

Re: Indicator switch/horn push -Special Sports

Post by Phillmore » Thu Dec 07, 2017 5:05 pm

They don't call Joe the Prince of Darkness for nothing :D
Andy

1954 Conquest Mk1, 1956 Conquest Mk2, 1957 Conquest Century Mk2, 1955 Austin A90 Westminster

ron.rsp
Posts: 43
Joined: Sat Feb 20, 2016 9:42 am

Re: Indicator switch/horn push -Special Sports

Post by ron.rsp » Thu Dec 07, 2017 7:06 pm

Lucas unit from 1938 EL24, on rewiring I found one side of the unit broken, I was fortunate to find this
replacement part!

Ron
Attachments
_DSC0074.jpg
Lucas TCS 34 British Patent and 321178
_DSC0073.jpg
LucasTCS 34 British Patent and 321178
_DSC0072.jpg
LucasTCS 34 British Patent and 321178

clevitt
Posts: 39
Joined: Wed May 18, 2016 1:02 pm
Location: West Hertfordshire

Re: Indicator switch/horn push -Special Sports

Post by clevitt » Thu Dec 07, 2017 8:25 pm

Terry, if it will work with the other parts of your switch assembly, you are welcome to the circular part in my photo.
Chris

qantasqf1
Posts: 60
Joined: Mon Mar 07, 2016 10:13 pm

Re: Indicator switch/horn push -Special

Post by qantasqf1 » Thu Dec 07, 2017 11:50 pm

Well now, Terry, fortune has smiled upon you. Rummaging through my extensive and comprehensive trafficator switch spares I retrieved a cancelling ring, pt . no. 323182 in bloody good nick - even the cam has no sign of wear. If you can’t source one in the UK it’s yours. I can post it to you if you email me your address.
stevemoore47@iprimus.com.au

Cheers from Oz.




quote=clevitt post_id=16615 time=1512678349 user_id=457]
Terry, if it will work with the other parts of your switch assembly, you are welcome to the circular part in my photo.
Chris
[/quote]
terryfrombury wrote:
Wed Dec 06, 2017 5:32 pm
Evening everyone,
I`m using the winter months to try to sort out the last couple of teething problems on the Special Sports. One of these problems is the failure of the semaphore indicator switch to self-cancel. It turns out that there is a bit too much wear in the slip ring which engages with the steering wheel, turns with it around the static switch unit, and pushes the little pieces which return the indicator lever to the central position. The Lucas part number is 323182.
I don`t suppose anyone has a less worn ring - or complete centre unit - do they?
Many ta`s
Terry from Bury

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