On my 1965 B40F, when I remove the sump filter I see two tubes. The larger diameter one, about 5/16" (8mm) o/d, I assume is the scavenge (return) tube? I prodded a wire in there, hoping to feel a ball bearing, but didn't feel anything, and can't see inside it because of oil. When I push the wire in, it goes up inside the tube about an 1 and 1/2" and then is stopped by something. A bend in the tube, perhaps? Just checking that is normal.
Also, what is the smaller dia tube I can see nearby? Is it a pressure relief tube? Again, I don't feel a ball in there.
Thanks in advance. Phil.