square taper crank keeps loosening

UncleMonty
UncleMonty Posts: 385
edited June 2009 in MTB workshop & tech
I while ago my crank started creaking (Alivio FC-M341) and I read somewhere that I should remove the nuts on the crank arms, grease the thread and then re-tighen, this worked for a while but now the crank arms keep comming loose

First it was the drive side every 30 miles or so then the non-drive size worked loose last night, I take a socket wrench out with me now and had to top twice on a 15 miles ride.

Is it the grease thats the problem, is it a good idea to de-grease and use a thread locker ?

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