gearbox clutch arm

[edboy]

my gearbox clutch pivoting arm is heading west. chewing up the alloy casing as it goes. the greased rod is being pulled inwards requiring constant clutch adjustment. this caused a wear cycle and seems a bad design. anyone had a go at gearbox cover repairs or tried a modification?

[trevinoz]

Ream or drill the cover and fit a bronze bush.

[edboy]

thanks for repy trev. have you done this? and is bronze the right material as the arm looks hardened.

[KiwiGF]

Ream or drill the cover and fit a bronze bush.

I second that, you may also need the arm ground round again, my engineer did this job but needed to put a lathe centre mark in the top (visible) part of the arm, not a biggie.

[trevinoz]

I have done a few.
Be careful drilling the cover as there is not much alloy around the hole inside.
I use leaded gunmetal bushes from a bearing supplier.
The first I did I drilled to suit the bush but later I machined the bush  o.d. smaller to lessen the chances of breaking through the alloy.

[Peter in Aus]

I set mine up in the drill press to get it square and straight and drill it out using 1/2 drill and make a steel bush to fit, don't make it to tight just a firm push fit and use loctite. I have done 4 like this with no trouble.
Peter

[edboy]

 my inclination is towards a steel bush rather than bronze. i now have to find some bar and search for the buried lathe at the back of the garage.

[RDfella]

Steel is likely to rust. May not be a problem internally if well greased, but will look bad outside. Bronze will last as long or longer (it is a bearing material)