Hello!

I'm trying to get engines to work, but they just don't move.
I tried to only use Buildcraft (no other mods) but it's still not working.

I'm not a Buildcraft pro, but this should normally work, right?
It doesn't work in singleplayer as well as on my server.

I'm using Forge 1.12.2, this is my Buildcraft version: buildcraft-all-7.99.24.6

is there actually something in the chest to extract?

Yes. Obviously. But now it works. I don't know why.