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Sometimes they’re just stiff and need some encouragement to go through. I’m going to guess the bike was sold without a preload cap, because I can’t see how the crank would “fall off” if it had one.
I reckon if you hit that crank with a rubber mallet from the drive side the left crank would fit no problem and stay on.
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Was the BB shell faced? Might have taken off too much from the 73mm shell...
grams
coventry_eagle
@velosaurus
Seen that exact damage before, where the 24mm axle doesnt protrude out of the bottom bracket enough and crank arm is only half on the 24mm axle. The example I saw was on a Fargo that was supposed to be a 68mm shell, but was actually 71mm (not 73 and the frame spec said 68). As a result the splines werent fully in the crank arm and stripped the inside of the crank arm just like that pic.
It looks on one of the pictures that the spindle isnt all the way through. Wonder why that is? Is there a spacer on either the drive side bb cup or chanset spindle that shouldnt be there? Maybe to allow the chainring on the inner chainset tabs to be far enough out not to hit the chainstays? Fix that problem and a new crank arm should sort it.