Speedo gearbox

[mikeydpippin]

Came back from a run and found the Speedo gearbox had moved forward, despite resetting this has continued to happen.
I've double checked every part has been fitted exactly as the attached drawing, I have small amount of up and down and sideways movement on the rear wheel bearing.
If I tighten the rear wheel spindle nut really tight, the wheel tightens up.
Checked the Speedo gearbox lugs are engaged.
Appreciate some help if possible

[56G80S]

Alan Jacobs (Biscuit) prepared this and it's right. http://www.jampot.com/pic_display.asp?id=820 .

If what you've done is different, it's wrong.

If you've done it as per Biscuit's illustration and it doesn't work I don't have an answer.

Johnny B

[mikeydpippin]

Thanks Johnny,
I have ordered new wheel bearings and will methodically go through every drawing I have including the late great Alans👍
Is there a repair for the thread on the Speedo gearbox, or are these available anywhere, for the 1957 G3

9121C285-07DB-4097-B96D-59C9A51E0333.jpeg

[TRFell]

I had this happen, but the bearing adjusting ring that locates in the dogs of the speedo came undone , unscrewed seizing the back wheel, there is modification if you have access to a lathe. A modified adjusting ring 021583 is recommended if the ring is not truly concentric with the speedo drive.