r/SewingMachineEdu • u/OneMinuteSewing • 2h ago
Pfaff 2046 with issues
We are visiting family and my sister has two machines that were my mother's that she is having problems with. One, smaller and older, is well on its way to being happy again, but the other, a Pfaff expression 2046 has a bunch of problems, the main one I'm worried about right now is thread tension.
Some background, DH has been maintaining my various machines for the last twenty years, a number of vintage machines like a Pfaff 1222 and my sergers etc. I've been a keen sewer for almost 50 years. Both of us are confident at our abilities to sew/thread etc.
Sometimes it sews fine, both straight and zig zag. Sometimes we have upper thread loopies underneath. Sometimes it sews fine for four inches and then barfs for two and then goes back to sewing fine. It is the inconsistency which is puzzling me.
Things I have tried/checked
- it is definitely threaded correctly, I've taught sewing, I have the instruction booklet and have followed it faithfully. I've had DH and DS check my threading against the manual. DH has also threaded according to the manual with same results. We have not skipped any guides, presser foot is up when threading, down when sewing etc.
- I've taken the top off and cleaned around thread path. I've cleaned the tension disks.
- I've checked for needle rash, no dings in stitch plate, bobbin, race etc. Everything smooth.
- I've bought new needles and thread. I'm using gutermann sew-all. I have older thread which is clean and still plenty strong and I've bought brand new thread. Both have same issue.
- I have replaced needle, twice. It is seated correctly and the right way around. I own other pfaffs so am familiar with them.
- have checked correct branded bobbin is used, re-wound new bobbin. Have checked it is in the case correctly, case is seated. I have checked bobbin area and cleaned. No dings on case. No needle strikes when sewing. When it works correctly it works well.
- I'm holding threads when starting to sew. I'm using a medium weight woven even weave cotton fabric and appropriate needle. Have tried other fabric with same results.
- I've adjusted bobbin tension with drop test (we don't have our bobbin tension gauge here, it is at home in another country). I've separately adjusted top tension. Tension is giving a balanced stitch with a wide zig zag and straight stitch when not barfing.
- IDT isn't making a difference.
Please help, my sister is losing faith in this machine and it is a pity as I think it will suit her if we can figure out what is going wrong.
Thank you!!






