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If the upper thread is still showing on the other side of the fabric, the tension is too loose. If it is pulling the bobbin thread up to the top of the fabric, the upper tension is too tight
OR the bobbin thread tension is too loose. (CAUTION: make only small adjustments to bobbin tension--1/8 of a turn at a time!!! It also helps to mark the screw groove location with magic marker on the bobbin case BEFORE making any changes so you can back it out and return to the original setting.)
Sears carries a lot of Kenmore manuals, however, there is usually a fee. Have never seen one for no cost.
BTW--be sure to use jersey or stretch stitch needles (ball point) for knit fabrics. You probably should use either a zig-zag or stretch stitch so the threads don't "pop" when the fabric overstretches the thread.
If the fabric is puckering when you sew, it is most likely because the thread tension is too tight. Make sure you are using a brand-new needle compatible with your fabric--using a 70 or 80 needle and a lighter weight thread may work better as a 90 or higher needle is big enough that it can stretch the fabric before penetrating it, causing puckering.. Puckering also occurs more frequently when sewing light-weight fabrics and may necessitate using a walking foot or a stabilizer to help give the fabric more body as it is stitched (wash-away stabilizer would probably be good when sewing washable fabrics). Another thing that may cause puckering is when the bobbin is wound at a fast speed. Slowing down when winding the bobbin will reduce the amount of stretch added to the bobbin thread. If it is stretched going onto the bobbin, it will shrink back up when it is stitched to your fabric. Also check whether your machine has a presser foot pressure adjustment. The pressure should be lighter when sewing finer fabrics, ie silk, and heavier when sewing thicker fabrics like wool or denim.
so looping on underside indicates top thread is not in tension, you need to recheck your threading from the thread spool, through the various thread eyes, the thread take up lever, the tension discs and then to the needle. It sounds like your thread has not gone into the tension discs fully. It is important to always thread up with the presser foot raised as this opens up the tension discs too so the thread can be laid in fully.
Check that your bobbin thread is not wound too tightly or too loose. Also adjust your tension down a click at a time until it stops breaking, testing on scrap fabric. Singer provided manuals online. Look it up here: http://www.singerco.com/accessories/manuals.html
hi! there wind thread on bobbins winder 4 times by your hand rotate clockwise,insert in shaft bobiins winder on top of your machine near hand wheel push latch to engage loop thread on disc winder tension start your machine on pedal foot automatically winder disengage if already filled up of thead pull this winder and insert to bobbins casing insert thread to slot and pull out winder should rotate clockwise as shown.insert on shuttle hook casing and close cover needle plate.next thread your upper
threading tension as shown on red threading from spool pull threading and loop to dial tension threading and insert thread to lever needle and to needle hole tip. pull tread under the needle foot and feeder tooth.rotate hand wheel counter clockwise to hook up thread bobbibs and appear at top of needle plate,teo thread shoul appear,set dial tension to # 3 and stich to # 8 range to # 12 depend on fabric and layer of fabrics and set on straight stich sewing,let needle on upper position insert fabric for trial sewiing.put down foot needle lever. manually by hand rotate for assurance needle is free to sew if obtruction on loop bobbins thread occurs adjust all tension gradually then try again until free from sewing w/o problem star sewing.