i have a berkley JG pump and we noticed that it was leaking at one of the eight big bolts that thread into the bowl. we tried to put silicon around the bot thinking it was coming through the threads but it leaked right away. i was wondering if that sounds like a seal or cracked bowl? I have it torn down to that point so far, and I were wondering if i should keep tearing it down? This is the first pump i have gone through and don't know all that much i would appreciate any help. thanks