Crank arm to BB; securing bolt(s) have loosened a couple of times in last few months. The arm hasn’t come loose on the tapered square drive BB - and I’ve never felt any movement between the arm and the BB. Just the bolt has loosened slightly. And both BB and crank are reasonably new……
So today I thought I’d do something about it. Tools and Equipment were assembled:
Old bolts removed:
BB internal thread / area around it cleaned with Cotton buds and White Spirit:
I was going to clean the grease off the bolts before re-fitting. Then noticed the two bolts I’d removed were different 🤷♂️ *Incase really old / re-used bolts had been mixed at some point; and for the sake of a few ££££ (And seeing as I had them ‘in stock’) - I quickly decided to refit with fresh bolts / new threads !
Extra Threadlock was applied to the bolt threads. Both inserted and then torqued to 45lb-ft.
Let’s see how this goes 👍