Rattle noise
 

Hi, I found a lot of drive oil inside my bellows so i brought my drive to a merc mechanic. He said it was the seal and he replaced it. He also replaced the u joints since the drive was off the boat anyway. Yesterday i started the boat up on a hose and noticed a rattling sound that i never heard before coming from the upper housing area. After doing some research i noticed that there is a procedure to adjust the rolling preload on the bearings.. If the preload was incorrect can it make a noise like this?
what else could it be.
Any help is appreciated

https://www.youtube.com/watch?v=au6xujfCaOk

https://www.youtube.com/watch?v=jWcaYPjrQBU