Speedo Cable

Post by **ani** » Wed Aug 12, 2009 4:00 pm

Here's pictures of my broken cable and speedo - couple of questions. 1275 midget engine with 5 speed Sierra gearbox Speedo is I think a Triumph but don't think it works properly anyway. Need to fit a new one and then look at maybe re-calibrating the speedo later.

What type do I need?
Difficult to undo it from the gearbox end - seems to be some kind of housing cover - do you just try and prize it off with a screwdriver?<br>

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Post by **cormorant** » Wed Aug 12, 2009 5:38 pm

Not sure what type of rear axle/diff ratio you have but speedo will have been changed to suit. Look for a tiny little number on the speedo e.g 1248 which gives the tpm (turns per mile) of the speedo. If you think the speedo is accurate then you need another one the same. Mini Cooper maybe? Probably get one on ebay.

Not sure about cable on a sierra box but no doubt someone will know.

Post by **simmitc** » Wed Aug 12, 2009 9:07 pm

On a sierra box the cable has a wide end which is retained in the box by a circlip.

Post by **ani** » Wed Aug 12, 2009 9:37 pm

How do you get the clip off then? It didn't look that obvious.

Post by **mike.perry** » Wed Aug 12, 2009 9:47 pm

There is a chart on the Series MM register website, click on car identity and scroll down. It gives a list of different Minor sized speedos with their TPM and applications

Post by **bmcecosse** » Wed Aug 12, 2009 9:51 pm

Aye - but this is not a Minor speedo - nor a Minor gearbox ! To test any speedo - use a reversible electric drill with a 'square' bit in the chuck. Run it in reverse in the speedo cable entry - just go gently - and the needle should rise and the miles start ticking up!

Post by **ani** » Wed Aug 12, 2009 9:51 pm

Thanks for that Mike

However what I'm trying to ascertain is how to detach the cable from the gearbox - tried but couldn't find where to undo it.

Post by **ani** » Wed Aug 12, 2009 9:58 pm

Nevermind I'll get it out somehow

Post by **bmcecosse** » Wed Aug 12, 2009 10:42 pm

Sorry - can't help here ani - I have no knowledge of the Ford box!

Post by **simmitc** » Thu Aug 13, 2009 1:56 pm

The cable goes into a sort of turret on the box. The circlip sits in a groove at the bottom so as to retain the flat plate on the cable. Once clean of oil/grease/dirt it really is impossible to miss - unless, of course, it's already been removed. It is only the cable that you're trying to remove, the drive stays in the box. I'll post a photo for you, if I get a chance.