Classic cars forum & vehicle restoration.
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Kleftiwallah
Joined: 27 Oct 2016 Posts: 222 Location: North Wiltshire
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Posted: Wed May 30, 2018 1:52 pm Post subject: Speedo drive connection |
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Good afternoon chaps.
Does anyone know the threadform on the inside of the brass knurled connector on the speedo drive, usually round the square drive?
After peering into the problem, I think it's 24 tpi and a core measurement of .435" (if that's any help).
7/16ths U.N.F. seems to do the trick, but could the thread be tapered internally?
Looking forward to your replies. Cheers, Tony. _________________ It may work in practice, but not necessarily in theory! |
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peter scott
Joined: 18 Dec 2007 Posts: 7126 Location: Edinburgh
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Posted: Wed May 30, 2018 4:47 pm Post subject: |
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Hi Tony,
I'm not sure of the size but I pretty sure it's not a tapered thread.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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MVPeters
Joined: 28 Aug 2008 Posts: 822 Location: Northern MA, USA
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Posted: Wed May 30, 2018 6:20 pm Post subject: |
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It might be easier to measure the outside of the speedometer head connection!
My Halda Speedpilot instruction sheet shows one speedometer cable with NF 5/8" x 18 connections - I think that's UNF - not tapered.
A 24-pitch thread would be 5/16 or 3/8 - quite a difference.
(The other cables are all metric M12 - M19 which I assume relates to foreign speedometers).
https://www.eaglefastener.net/technical/fine-thread.html
https://www.motalia.com/Html/Charts/unf_chart.html _________________ Mike - MVPeters at comcast.net
2002 MINI Cooper 'S' |
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Kleftiwallah
Joined: 27 Oct 2016 Posts: 222 Location: North Wiltshire
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Posted: Thu May 31, 2018 1:11 pm Post subject: |
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Thanks for those useful answers, (even from the settlers across the pond)!
Thanks and Cheers, Tony. _________________ It may work in practice, but not necessarily in theory! |
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Kleftiwallah
Joined: 27 Oct 2016 Posts: 222 Location: North Wiltshire
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Posted: Thu May 31, 2018 7:22 pm Post subject: |
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The teeny tiny screw was also missing that secures the 'bowden' cable to the speedo but with a careful threadmaking of 8BA on a piece of filler rod it fits a treat.
All I have to do now is re-thread a countersunk screw and we're away.
Cheers, Tony. _________________ It may work in practice, but not necessarily in theory! |
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