6 replies to this topic

[Dylpants80]

Hi all. My Speedo stopped working a few months ago which was quite new,so I replaced the cable and it was working fine for about 10 miles or so then it stopped working again. Can anyone advise on why this is happening? Thanks

Edited by Dylpants80, 21 March 2025 - 06:54 PM.

[DeadSquare]

Hi all. My Speedo stopped working a few months ago which was quite new,so I replaced the cable and it was working fine for about 10 miles or so then it stopped working again. Can anyone advise on why this is happening? Thanks

What was the damage when you dismantled it ?

 

Did you replace the inner and outer ?

[Spider]

Two possibilities come to mind.

 

There was a change at some point in speedo cables and Drive pinions, the early ones having a 1/8" square ends, and the later types went to 3.0 mm, a small change but can make a difference to the point where they can slip.

 

The other thing is the Cable Drive Pinion (in the gearbox) can slip on the shaft, I'm thinking this is the most likely cause on yours. I get to them from under the car, removing the LH Pot Joint gives good access to them. Just be sure to jack up the LH side of the car nice and high before removing the Pot Joint or drain the oil.

[bpirie1000]

I would suggest remove cable at gearbox end and spin the cable make sure the gauge is working.... can also turn the ft wheels when jacked and see if the worm gear moves...

[Dylpants80]

Hi all. My Speedo stopped working a few months ago which was quite new,so I replaced the cable and it was working fine for about 10 miles or so then it stopped working again. Can anyone advise on why this is happening? Thanks

What was the damage when you dismantled it ?

Did you replace the inner and outer ?

I just put a new Speedo cable on.

[Dylpants80]

Two possibilities come to mind.

There was a change at some point in speedo cables and Drive pinions, the early ones having a 1/8" square ends, and the later types went to 3.0 mm, a small change but can make a difference to the point where they can slip.

The other thing is the Cable Drive Pinion (in the gearbox) can slip on the shaft, I'm thinking this is the most likely cause on yours. I get to them from under the car, removing the LH Pot Joint gives good access to them. Just be sure to jack up the LH side of the car nice and high before removing the Pot Joint or drain the oil.

is this an easy job? How would I know what part I need to replace it with?are they all the same?

[Spider]

is this an easy job? How would I know what part I need to replace it with?are they all the same?

 

I'd judge it as a somewhat easy job. There were different pinions fitted, you'd really need to remove yours and do a tooth count or most of the time, if the Pinion is slipping on the shaft, you can clean and glue them together with one of the better superglues.