square taper crank keeps loosening

UncleMonty
Posts: 385
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 ?
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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Comments
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Sounds like the crank arms are worn and are not fitting properly on the bottom bracket.
Try the degrease, use thread lock as you say - and retorque. Also make sure the crank taper and BB taper are spotlessly clean.
If it comes loose again, time to replace.0 -
I had a similar issue when dust got inbetween crank and BB taper, Once cleaner thoroughly and greased I haven't has an issue in 2 months of riding almost everyday.0
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ok, cheers !0
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Don't grease square taper cranks - its possible to split them if you do.0