Jump to content
Click here if you are having website access problems ×

Speedo Drive


Recommended Posts

Good Morning,

i have currently got the engine and box out of my car (5 speed) whilst it is away at arch being re-skinned and long front. 

Last night I was cleaning the gearbox and engine and decided to check the speedo cable and drive. On the gearbox itself where you screw the 90 degree angle drive to it ( the brass threaded part) it is loose and I cant figure out how to tighten it.

im worried there is either nothing inside or that it wont work when it goes back together?

also when i try to attach the 90 degree angle drive the threaded part on the gearbox will just turn. I have a quill to insert to replace the broken allen key

Ive never managed to drive the car as it is a restoration that turned out to be a shaped like a banana hence the new front.

Can anyone tell me how to tighten the brass bit? someone on the facebook group said there should be a circlip. i cant see one anywhere (which could be the problem)

Has anyone got any photos or diagrams please?

Link to comment
Share on other sites

It's a while since I played with angle drives and speedo cables, but IIRC this is what you should have:

A worm drive in the tail of the gearbox, with an oil seal and a hole in the end to accept the square-section quill

A brass "top hat" adaptor.  This sits in the gearbox aperture, on top of the oil seal.  The top hat is held in place by a circlip (there's a groove for this running round the inside of the gearbox aperture) but is otherwise free to rotate.  The threaded section attaches to the collar on the angle-drive.

Tightening the angle-drive collar onto the top hat can be a real pain.  You could try gripping the top hat with a pair of long-nosed pliers as close as possible to the gearbox to stop it rotating.  Or you could remove the circlip and the top hat completely, attach the collar, replace the whole and reinsert the circlip.

... to replace the broken allen key.

I didn't quite follow that bit?


Link to comment
Share on other sites

  • Area Representative

If I am understanding you correctly the "brass top hat" is meant to be loose. It is held in by a circlip but this doesn't hold it rigid. It will still spin and move about. To remove the angle drive I hold the top hat with a small screwdriver or similar and undo the angle drive by hand or pliers (if necessary) on the knurled part. 

Link to comment
Share on other sites

The other problem with it being free to rotate is that it can come loose . . . say when you are reversing out of a parking space in a car park in the Black Forest . . . suddenly notice that the speedo doesn't work a mile down the road after it fell off . . .

Mine has had a collection of tie-wraps around it to try to stop it, or hang on to it if it does it again - 18yrs later, they still seem to be working :)


Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...