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Smiths gauges
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trampintransit



Joined: 09 Aug 2010
Posts: 166
Location: Edinburgh

PostPosted: Sun Jul 22, 2018 2:37 pm    Post subject: Smiths gauges Reply with quote

The speedo on the Armstrong has suddenly gone bonkers. Sounds like the magnet is touching the needle backplate or whatever it's called...I'm ahppy to take it out and have a look, but even if I get it apart I'll presumably reveal a broken or worn part...so what's next...where does one go for parts for these things?

For the record, it says '1080' on the front..which also seems to be the number on a Jag420 speedo which has a different max speed, so I'm not sure useful the code is?

There must be a Smiths guru out there somewhere?
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'60 Armstrong Siddeley Star Sapphire
'80 Reliant Scimitar
'47 Jaguar MKIV --- in bits!!!!
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trampintransit



Joined: 09 Aug 2010
Posts: 166
Location: Edinburgh

PostPosted: Sun Jul 22, 2018 2:42 pm    Post subject: Reply with quote

Ah ,,found these...

http://obswww.unige.ch/~wildif/cars/docs/Smith-jaeger_speedo_repair.pdf

and

http://www.jdo1.com/speedos.html

But that doesn't look like a source of parts..I'd like to try to fix it myself?
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'80 Reliant Scimitar
'47 Jaguar MKIV --- in bits!!!!
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peter scott



Joined: 18 Dec 2007
Posts: 7113
Location: Edinburgh

PostPosted: Sun Jul 22, 2018 3:39 pm    Post subject: Reply with quote

You could also try:
http://www.speedograph-richfield.com/

Peter
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1939 SS Jaguar 2 1/2 litre saloon
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47Jag



Joined: 26 Jun 2008
Posts: 1480
Location: Bothwell, Scotland

PostPosted: Sun Jul 22, 2018 8:54 pm    Post subject: Reply with quote

TT,

By bonkers do you mean that the needle is oscillating wildly? This can be caused by the speedo cable needing cleaned and re-lubricated. Disconnect from the speedo and pull the cable into the car. Try that first before opening the speedo up.

Art
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jp928



Joined: 07 Jun 2016
Posts: 249
Location: Australia

PostPosted: Mon Jul 23, 2018 7:54 am    Post subject: Reply with quote

Sounds like cable windup - part gets stuck briefly the releases sharply then sticks again. The number on the face is commonly revs/mile, for calibration purposes.
jp 26 Rover 9
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