Right. Square taper crank arms, have been on my 5 since at least 2004 and now BB is dead. Drive side crank arm came off easily, but I goofed on nds - didn't get the bolt in properly and completely stripped threads. No amount of whacking the arm will loosen it off the taper (bolt is out).
How do I get the arm off? The only thing I can think of is heat, but don't want to damage frame.
Ball joint breaker works a treat. Done it twice like this.
use a crownrace removal tool it will start it off lovely and then gently tap off with a flat head screwdriver
I cocked this up once. It required a lot of filing / hacksawing / bashing and swearing to get the crank off in little pieces. That was the drive side.
Should be possible with a hacksaw, or drill into the crank arm close to the taper and try to relieve the pressure on the taper.
Thanks guys - good to know it's not just me!
Tazzy - genius. I have one of those why didn't I think of it?!!
Tazzy - genius. I have one of those why didn't I think of it?!!
because you are not a ham fisted buffoon who used to be overzealous wit tightening things up 
I found the lump hammer and windmilling technique works in these situations
I used the 4" angle grinder on the wifes when that was seized on. Nice and quick.
Recently used a 2-arm puller to remove one easily, works in a similar way to a normal crank extractor, only hooks around the outside of the crank instead of screwing into it(also used a G-clamp around the arms to stop them spreading/slipping).Your local garage may let you use one of theirs,or you could get one from any decent tool or tool hire shop.
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