Have you tried a brand-new needle? Frequently, a bent or damaged needle will make noise.
If you are able, hand turn the handwheel and watch the needle and hook action. You may see the needle hitting. Or try removing the needle and listen if the sound continues. If it doesn't, then it's the needle. If a new needle doesn't cure the problem, could be the needle/hook timing is off. May need service.
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have you tried contacting singer about the problem, it could be a sensor, if it's malfunctioning, having it replaced may be the only way to fix the problem,, if it's still under warrenty, they may have you take it to a sewing machine shop to repair it..
here are 2 links to see if singer can help you with the problem
Contact Us Singer SewingProducts Singer Sewing Co
1. You will likely need to adjust the bobbin tension. Make sure that you have placed the thread under the tension spring to start with.
2. If it is bunching up on the bottom your tension on the bottom is too strong. Before you do anything you can increase the top tension to offset this so you won't need to mess with the bobbin if it isn't a great amount.
3. JUST FOR INFORMATION: When you change threads they are either thicker, thinner or the same. This will require most of the times to adjust the bobbin.
SEE BOBBIN ADJUST:
Two possibilities. Your needle is not in the correct position to receive the thread. It could be bent just enough to throw it off. Try changing needles, or moving the needle to the center position, and all the way up.
The second issue is the tiny hook that goes through the eye of the needle is bent. You can use tweezers to gently bend it back so it goes through the eye of the needle.
If the issue deals with it not moving when pushed, it may need taken in for service. On a side note, order a bobbin case for your machine, even if you don't need one. They may not be available in the future.
Then hand wheel is secured to the machine in one of two ways. The first is there is a white disk, and if you pop it off there is a screw underneath.
Sounds, though, like yours is a force fit. That is, it is removed by squeezing it together and rocking it from side to side. It would go back on the same way. There is a YouTube video that demonstrates hand wheel removal and replacement for both types of hand wheel, and you can see which you have. Here's the link: https://www.youtube.com/watch?v=vIAfiy-xGsY&list=UUSicV9kXB2fmm3z_0FKSA_A&index=10
It could be that it's cracked, but it can be replaced if it is.
Could be that your bobbin thread is wound too tightly and having a problem pulling thread from it. Try setting the pressure on bobbin a bit less and that may cure it.
Yes the covers come off all machines. That does not mean it is easy to do. Since the problem is not on every stitch I would check the tension by installing a size 80 needle put the presser foot down and pull on the thread towards the back at a 45 degree angle to the direction of sewing. The needle should bend about a 1/8 to 1.4 inch at normal tension. If the tension is steady it could possibly be other reasons that the loops are forming under the fabric. Such as a burr on the hook, or bobbin case, lint, or clearance between the positioning devices for the bobbin case. I made a video about tension problems that are not actually caused by tension. I also did one on common repairs for a top load bobbin sewing machine.
Presser Foot Release Lever:
First, check if the presser foot release lever is functioning properly. Sometimes, it may be stuck or not engaging correctly. Make sure it moves freely and isn't obstructed.
If it's not working, try slackening the presser foot tension using the dial on top of the machine. If that doesn't help, you might need to adjust the presser bar slightly.
Presser Bar Adjustment:
If the presser bar was loose to begin with, completely slacken off the pressure.
Put the presser foot up using the lever, then slacken off the screw on the bar and adjust the presser bar as needed.
Handwheel Stuck:
If the handwheel is stuck, it could be due to issues with gears, cams, or other internal mechanisms.
Inspect the machine's casing or access panel for any signs of damage, such as broken teeth on gears or misaligned cams.
Thread Take-Up Lever:
If the take-up lever isn't moving up and down even when you manually turn the handwheel, check the hand clutch.
Tighten and adjust the inner portion of the wheel on the right side of your machine and the hand clutch.
If these don't do the job, you might consult Singer's customer service or a repair shot.
