Same problem on a singer 4166

I would suggest that you have it serviced. It definitely sounds like the timing is off, but adjusting the timing can be tricky, and if it's not done properly you can REALLY screw things up!

just adjust to needle in fix to strait in needle clamp hole it operate to needle strait to hole so needle do nt break but needle is best buy qualtity

Sounds like it's advanced.... but take it in and have it done professionally... have him lube and clean and check for cracked parts while you are at it.

Yep, it's out of time. Take it in for service. Ask for cleaning, lubing and re-timing. Otherwise they will just time it and if it is dirty and dry... it may just fall out of time again.

Also remember you can never turn the hand wheel backwards to the way it is intended to go... that causes this issue in some machines.

Go to the singer website
Click on customer support--there will be a drop down menu
Choose instruction manual
In the box type the model number---4166
Click search

First, try a brand new needle. If it was damaged by the previous activity, then it could be causing both problems.

Your needle is probably to long or you need to open it more

Check you have the right size bobbin case the gap where the needle enters should be 13mm approx at the widest point. A lot of other pfaff bobbin cases seem to fit and can be easily be mistaken. I have two pfaffs and have accidentally mixed the cases and had a similar problem.

A bent needle will hit the metal. If it continues you will need to adjust the needle carrier. hopefully that isn't bent, but if so I don't believe that the replacement of it will be too costly.

With the needle hitting the bobbin case , it sounds like it might be out of time. Which I am sorry to say is not an easy at-home fix.