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R 35 and maybe R2/3/4 speedo drive
Posted: Tue Dec 21, 2021 1:36 pm
by cwf
Hello, I have an R 35 (340cc single) which has a gearbox similar to the R 2/3/4 and maybe others. My problem is that, to remove the gears, I have to remove the speedo drive worm. I think this is an interference fit on the main shaft. I've tried heat and there's very little room to lever the worm away from the bearing. New worms and driven gear are about 150 Euros. Has anyone done this? Any ideas?
Thanks, Charlie.
Re: R 35 and maybe R2/3/4 speedo drive
Posted: Mon Jan 03, 2022 2:14 pm
by cwf
In case anyone comes up against this problem, here's how (or not): I visited a friend with oxy/acetylene and that, combined with sharpened screwdrivers as levers and some violence, succeeded.
The mainshaft would still not come out, so we managed to extract the output bearing but still no joy. Then we drove out the layshaft axle from the clutch side. This allowed those gears to drop, which allowed the mainshaft out. Beware the spacers on both shafts. Maybe the bearing can be left in place if the layshaft is dropped first.
The speedo drive gear has blued, so maybe the temper has been disturbed. There was something on the output bearing, maybe a seal, not present on the inner side, which has burned. Now to see if I can work on the good box without damaging anything.
Charlie.