When to use Loctite on a crank bolt?
The use of a new crank bolt is mandatory, as bolts do stretch and lose their holding strength if re-used. The use of loctite on the bolt threads increases that holding strength even more. Loctite compunds on the crankshaft-pulley contact area also serve to increase the holding strength.
Why does my right crank arm bolt keep coming loose?
Anyone else’s right crank arm bolt keep coming loose? (Rail 7) Mine does every single ride now. Surprised it’s not an interference fit (the crank arm), it comes right off. It seems like a design issue, and I’m not sure how to fix it. Open to suggestions! My left crank arm bolt came undone the other day after 400-odd miles.
Why does my LHS crank bolt keep loosening?
Lost my LHS bolt during a knarly downhill & didn’t want to put the arm back on so rode out with it in my pack. Had a look this morning & the crank arm has a few knicks inside it towards the inside of the arm where it has sat halfway on moving over the steel axle.
Do you need a new crank pulley bolt?
It’s just a reassembly of the crank pulley assembly using new parts on the old crankshaft. The use of a new crank bolt is mandatory, as bolts do stretch and lose their holding strength if re-used. The use of loctite on the bolt threads increases that holding strength even more.
Lost my LHS bolt during a knarly downhill & didn’t want to put the arm back on so rode out with it in my pack. Had a look this morning & the crank arm has a few knicks inside it towards the inside of the arm where it has sat halfway on moving over the steel axle.
Anyone else’s right crank arm bolt keep coming loose? (Rail 7) Mine does every single ride now. Surprised it’s not an interference fit (the crank arm), it comes right off. It seems like a design issue, and I’m not sure how to fix it. Open to suggestions! My left crank arm bolt came undone the other day after 400-odd miles.
What to do if your crank thread is stripped?
Sounds like your crank thread is stripped. You can fix it by replacing it with a Shimano UN54 bottom bracket. You an also try a fix till you have money. Clean the threads very carefully with, nail polish remover (acetone, Rubbing alcohol, automotive brake or carburetor cleaner.
Why does my crank wrench keep loosening up?
Dry threads have too much friction and can trip the torque wrench before the proper torque at the bolt head has been reached. Loctite performs the same function as grease in that it helps reach the proper torque. Until it sets of course. My rule of thumb is to loctite the bolts that should have it, and grease all the others.