Originally Posted by
miamijim
...My go to tip for removing stubborn crank arms is to heat them for a few seconds with propane torch, the aluminum expands a tick and they come right off.
Heat should be effective in every case where something prevents the arm coming off with the available pulling force.
If it works for a steel cotter crank, it should work much better with an alloy crank, which has much greater thermal expansion.
But did you mean perhaps a few
minutes? Alloy sucks up heat all the way down the crankarm, and I would try for 200 degrees or so which might take nearly a few minutes I'd guess. I give steel cotter cranks a minute and a half, at least.
...Or does your propane torch look like
THIS:
