I took another 30 min test ride, and the compression bolt loosened itself again. It moved approximately 4/20 turn counterclockwise to the point where the cranks touch the BB cups with no preload. The left crank arm moved outward a little bit, since there was a little bit of play, but not as much as during the 1st ride.
The torque on the clamping bolts on the left crank was still 16 Nm like I set it to. I had the compression bolt torqued against the left crank arm to around 6-8 Nm.
After the ride, the compression bolt loosened itself to the point of zero torque. If I tightened it again, the left crank does not move inwards enough to its original position so there is still too much play.
I had to loosen the left crank and start the installation procedure again.
The compression bolt has no thread tape or compound. The instructions don't mention to use them. Perhaps I will have to?
It's the first time I'm using an integrated axle with external BB. I've only used JIS square taper BB's before this one.
Last edited by tomtomtom123; 04-12-18 at 11:44 AM.