11 replies to this topic

[Rio]

Rather than remove the rad etc, can you access the Speedo Drive from underneath?

[nicklouse]

which bit are you trying to get to?

[DeadSquare]

Yes.

A socket with universal joint and extensions, worked by someone above, with someone holding it on the bolt.

 

Take out the unit rather than trying to unscrew the cable.

[Rio]

Thanks for that. Awkward but better than taking rad etc out :)

I just want t remove speedo drive to see how many teeth it has and to determine which one I need to reduce the speedo over reading by 10%

Thanks again
Andrew

[nicklouse]

So you want to guess which bit is driving it?

[DeadSquare]

If it is only 10%, leave it as it is.

 

It might save you a few points on your licence.

[Spider]

Having tried all manner of getting at them, I usually get at them from under these days.

 

Jack up the passengers side as high as you can (about 300 - 400 mm), pop the top ball joint, pop the drive shaft from the Pot Joint, pop the Pot Joint off. All the access you need.

[Rio]

So you want to guess which bit is driving it?

Not sure what you mean but I was under the impression it was the speedo drive gear on the gearbox that the cable attached to

[Rio]

If it is only 10%, leave it as it is.
 
It might save you a few points on your licence.

Good point but when speedo is ready 70mph and 2 satnav a show you're only doing 662mph, it's a bit disappointing.

Imagine if I did 80mph, the speedo would go back to zero

[Orange-Phantom]

Having tried all manner of getting at them, I usually get at them from under these days.

 

Jack up the passengers side as high as you can (about 300 - 400 mm), pop the top ball joint, pop the drive shaft from the Pot Joint, pop the Pot Joint off. All the access you need.

This is something that I may have to look at seeing as I've just built a new dashboard with a MGB speedo (1280tpm) and have changed the final drive.  I've no idea if it'll read accurately as the previous Stack Dash ran off a wheel sensor so I'll find out!  I've used Guessworks very helpful speedo ratio calculator so I will know where to go if I need to change the worm and pinion http://www.guess-wor.../Tech/ratio.htm

 

Your technique to get to the speedo drive may well make my life easier so it's a thank you from me too!

[DeadSquare]

Type into gurgle,

 

" How does a classic Mini speedo drive work ? "

 

And about the 6th down is an exploded diagram

[Dusky]

So you want to guess which bit is driving it?

Bit of math and you know it. Got the speedo tpm and know its misreading 10%.