Hey, I just posted this in the mechanics forum. Anyone here have ideas?
I have standard, modern, Shimano "cups" threaded into a titanium shell on my commuting bike. All parts are relatively new. Since installation, the BB has gotten creaky every few months and responded to torquing back to spec, but no longer. I tried a heavy application of blue thread locker and then about three wraps of PTFE tape (cups still screwed in easily) when that didn't work. The tape helped, but didn't fix it.
What should I try now, more tape? Is there anything else?