Bobbin/raceway and timing problem; Necchi 3577 (by 2 users)

I was sewing a blanket and ran out of thread in th bobbin, I removed th bobbin and threaded it and put it back together as I have done a few times before raising th needle as high as possible. It seems to fit in there but when I test it to begin sewinging it backs a rattling sound. The needle then gets caught( but doesnt break) in the mechanism when the it goes down to cathch th thread from th bobbin. It might be th timing, I was told that I could adjust it my self with some patience. On occation th bobin mechanism will pop out before or as th needle gets caught. I reaaly like this machine and it has only been used a few times so its is literally like brand new. From what I gather th machine has to be turned on its side to adjustr that section of the machine. I dont know much about sewing and have done this more or less by trial and error so if I could get some detailed instuction on this matter would be great. I am waiting for my instuction manuel to get here but I dont remember anything like this in th instuction manuel. Kaidengehn@hotmail.com