The BSA A7-A10 Forum

Technical => Clutch, Primary, Gearbox => Topic started by: Fredl on 05.01. 2014 17:23

Title: Speedo Drive 'O' Ring Oil Leak Prevention
Post by: Fredl on 05.01. 2014 17:23
Happy New Year!

I am having issues with oil making its' way up the speedo cable and gumming up the speedo mechanism - I hear there is a solution whereby
an 'O' ring is fitted at the gearbox end to prevent this happening?

Anyone fitted one and could advise as to how to do it / where to buy the appropriate seal etc..?

Many thanks!
Fredl
Title: Re: Speedo Drive 'O' Ring Oil Leak Prevention
Post by: bikerbob on 06.01. 2014 09:24
If oil is getting up into the speedo then it suggests that the driven gear part No67-3175 is worn or the gear bush and should be replaced, fitting an O ring on that spindle will need to have groove machined into the spindle this will mean having access to a lathe as to size that would be determined by the depth of the groove as the inside size of the O ring and the outside size by the diameter of the gear bush. You would also have to be careful not machine too great a depth of groove in the spindle as you would weaken it. I would take the easier option and replace the worn parts.
Title: Re: Speedo Drive 'O' Ring Oil Leak Prevention
Post by: Fredl on 06.01. 2014 15:18
I just received this advice from Draganfly:

In case of leaks, make sure the spiral groove on the speedo spindle is clean and you can fit a small fibre washers at the speedo spade to help prevent oil leaks


Thanks Bob - I think the part might also need replacement as at around 60-65mph the needle flickers in 5mph increments which (I am told) means the part you describe being worn...think I should use the washers AND replacement the part!

Thanks again