Hello all. Well, after quite a few rides on our tandem I noticed some creaking coming from the captain's cranks. Flipping the bike over I noticed that the eccentric must have been over torqued at some time and now there is a nice crack running along the bottom of the eccentric bottom bracket shell. The frame is aluminum. I'm pretty confident that I can get it repaired here locally.
My question is... What is the torque value for clamping an eccentric bottom bracket? There are two allen head bolts on the shell.
Or, is it a tighten it just until it won't move kind of thing?

Thanks
LouM...
Scott 808 tandem