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Left crank arm problems

bornsinnerbornsinner Posts: 3
edited September 2014 in MTB workshop & tech
Hello everyone, just signed up to the forum. :oops:

Having some problems with my recently purchased Falcon bicycle, although it may not be specific to mountain bikes I've posted here because it's a mountain bike. Maybe a mod could move this if need be.

I've done less than 100 miles on this bike and the left crank arm has become lose and fallen off. After putting it back on and tightening the nut I've been out and done another 4 miles or so and it's come off again. Today I took a trip to Halfords to buy a new left arm and fitted it, but after another few miles today it's come off again. I don't know much about bikes and I'm now stuck as to where to go next.
I've uploaded some pictures of the nut, crank arm and left side of the bottom bracket but not sure if I'm allowed to post links or not?

Any help would be greatly appreciated,
Thanks.

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