My crank has a little slack and cracks more and more when I pedal, but only on only with the left pedal.
What could be the cause(s) of this ?
Video of the loose crank:
Video of the cracking crank:
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If it is an older 3-piece crank, and if you feel play on the left-side downstroke, then it could certainly be a loose cotter, but it could also be that the bearing cap needs to be tightened in a tad more. I have an older 3-piece crank (w/ loose ballbearings) and I've had to do that before, especially after an overhaul when things tend to loosen up after a few rides.
Of course, there are many types of bottom brackets, as explained here: