Lotus Elan

Smiths Speedo - SN 3273/04

PostPost by: SENC » Wed Nov 24, 2021 4:04 pm

Thanks Mike, very helpful article!

John, thank you.

1 - Yes, the drag cup appears to rotate fairly freely and spring back, though if just turned slightly (say in the 10-20mpg range), it is 50/50 getting hung there.
2 - Yes, the magnet wheel does rotate when the drive is rotated.

After reviewing the flannery website and Mike's article, I'm guessing primary potential causes are some dust/lint/grime buildup or maybe lack of lubrication inhibiting free movement. That might jibe with the speedo getting "stuck" - and perhaps in disconnecting the cable, removing the gauge from the car, and partially disassembling it I dislodged enough to get the movement I'm seeing now. I will test for better pointer movement with a drill (in reverse), but regardless of the findings think I'll at least go as far as disassembling the drag cup and magnet wheel to inspect, clean, and lightly lubricate.

As always, would welcome guidance, words of caution, or even contradictory opinion from those who have experience.
Henry
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PostPost by: john.p.clegg » Wed Nov 24, 2021 4:33 pm

Be careful when removing the needle , I have bent spindles before,,, even snapped one that was V tight .

Work over a white sheet , makes losing bits harder.....I think it just needs some thin lubrication , WD40 ? Silicon fluid?

John ;-)
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PostPost by: nmauduit » Wed Nov 24, 2021 5:48 pm

SENC wrote: I will test for better pointer movement with a drill (in reverse), but regardless of the findings think I'll at least go as far as disassembling the drag cup and magnet wheel to inspect, clean, and lightly lubricate.

be careful with the lubricant you use (WD40 is not a lubricant), you don't want it to become sticky over time and have dust collecting at the contact tip (possibly jewel).
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PostPost by: 661 » Thu Nov 25, 2021 11:20 am

I've just had some contact with the firm below

http://www.chronometrics.co.uk/

May be useful, although my degree of contact wasn't enough to allow a judgement on the quality of their work
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PostPost by: ericbushby » Thu Nov 25, 2021 11:46 am

Hi Graeme,
Have you noticed that `Chronometrics` state on their website that they do not repair magnetic instruments. Yours is magnetic. They may not be the best people for the job. Speedy cables did a good job for me.
It seems to me that it needs stripping and cleaning.
I do not know what lubrication the disc pivot needs. If it is hardened steel then a light thixotropic oil like clock oil would do nicely. That is, if it should be lubricated at all.
Eric in Burnley
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