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+--- Thread: Speedo Drive Belt Spring (/showthread.php?tid=9899)
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Speedo Drive Belt Spring - themaces - 17-03-2025
The speedo drive belt on my early Chummy failed over the weekend leaving me without speedo and mileage indications. I've spoken to the Seven Workshop and Holmesdale Sevens, but it seems the spring belts are no longer available. I'm considering a few lash-ups to get things working, but I'm extremely receptive to any lessons or experience others have on solving this.
Chris
RE: Speedo Drive Belt Spring - themaces - 17-03-2025
Going to give this a try:
RE: Speedo Drive Belt Spring - "Slack Alice" Simon - 17-03-2025
I have never looked at the set up of a belt driven speedo.
I guess that poly belt will do the job.
If not: you can probably still get the leather round "belt" that old sewing machines use. This is cut to length and joined with a metal U shaped clip.
Or - there is a local V belt stockist here that I could take the old belt to, and they would come up with something a similar length.
Similar places must be available elsewhere. :-)
RE: Speedo Drive Belt Spring - Chris KC - 17-03-2025
(17-03-2025, 02:43 PM)Slack Alice Wrote: I have never looked at the set up of a belt driven speedo.
I guess that poly belt will do the job.
If not: you can probably still get the leather round "belt" that old sewing machines use. This is cut to length and joined with a metal U shaped clip.
Or - there is a local V belt stockist here that I could take the old belt to, and they would come up with something a similar length.
Similar places must be available elsewhere. :-)
You can certainly get round rubber belts for sewing machines in various sizes - eBay.
RE: Speedo Drive Belt Spring - Alan - 17-03-2025
A suitable circumference O Ring should suffice if all else fails, just you will have to remove one end of the propshaft to fit it. My belt driven speedo is inaccurate enough to be useless anyway.
RE: Speedo Drive Belt Spring - Jamie - 18-03-2025
You can also buy lengths of a rubbery belt with a rough surface, rather like scales, for grip. You cut it to length and join it by melting the ends and pressing them together. I use it to drive my lathe.
RE: Speedo Drive Belt Spring - themaces - 18-03-2025
Thank you all for the reassurance.
The temporary belt should arrive today and I'll give it a go; but before I place too much faith in it, I'll at least measure the size/length required and probably order a sewing machine type belt (accepting of course the prop shaft/access faff!) unless anyone knows the size please?
Chris
RE: Speedo Drive Belt Spring - Tony Griffiths - 18-03-2025
If you can manage it, the very best belt is the genuine Swiss-made "Polycord". This is joined by melting the ends together - but then, of course, you have to clean off the excess material, probably with a Stanely knife while on your back under the car. It's easier to do it off the car with a small flap wheel and then dismantle the drive system to fit it. See: https://store.lathes.co.uk/belts/solid-round-plastic-belts
RE: Speedo Drive Belt Spring - Ian Rendle - 20-03-2025
I've got a spare spring belt if you need one, and it doesn't require removal of the Prop shaft.
Ian
RE: Speedo Drive Belt Spring - themaces - 13-04-2025
Hi @IanRendle
I did try to pm you a few weeks ago regarding the spring belt. Please drop me a line if you still have one.
Chris