There are several things that can cause the top thread to break. Tight tension on the bobbin thread could be a problem, but you may have a different issue if the thread is catching in the bobbin case.
Something worth trying: install a brand new needle. Remove all the thread from the machine, ALWAYS RAISE the presser foot, and rethread the top thread from the beginning. Confirm the thread path is correct. Also, rethread the bobbin case and verify the bobbin is turning the correct direction in the bobbin case. Also, try a different type of thread (AVOID old or bargain bin thread.)
Why does the upper thread keep breaking Brother
Why is my thread breaking
Sewing Machine Problem 1 Thread Breakage
One more thing. You mentioned it is a vintage machine. Has it been thoroughly cleaned and oiled recently? These old mechanicals need frequent and regular TLC to keep them purring. It could be the bobbin area needs fresh oil to keep it rotating smoothly.
Wheel on right side that controls the needle up and down is very tight...
SOURCE: Machine not sewing
Make sure you have threaded the machine from right to left, it sounds like the needle thread is trapped under the lower looper thread and cannot form a stitch.........start the threading over from scratch like this:
Is there a diagram for how to thread on the inside of the door ?
Follow that slowly and carefully to make sure you have not missed any thread guides on the way, as each one needs to be followed through to ensure correct tension and thread progression.
If you are certain that all threaded correctly, did you have a fabric jam and pulled it loose ? If so, the timing may well be affected.
Post an update and we'll get this right.
Bargain Box
SOURCE: Bobbin thread breaks
Make sure your bobbin thread is turning clockwise as it sits in the bobbin case. There is a screw on the outside of the bobbin case you can turn with your thumb slightly to adjust tension. If you dangle the case from the thread and give it a light ****, it should move down slightly when doing so-an indicator of good bobbin tension.
SOURCE: Baby Lock Serger Thread keeps breaking
Mmmm...., maybe NOT the solution, maybe, just a key.
I have a copy of theBaby LKock EA-605 instruction booklet in English, Germann, French and Spanish. NO ideas how it casme into my orbit, but happy to pass it on.
SOURCE: singer simple sewing machine will not sew
need needle threading instructions singer 3116 simple. pictures would help. thank you
SOURCE: Top thread stitches correctly but bottom thread loops.
FYI---- Loops on the bottom-- problem is in the threading..
Loops on the top--- problem is with the bobbin.
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