Question about Sewing Machines

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Maybe a timing issue?

My Singer 14sh654 serger has a problem I can't figure out. When I turn the hand wheel, it makes a clunking noise like metal on metal. When I try to sew, the knife won't cut the fabric (although it's in the correct place and it's sharp) and the thread bunches up on the fabric. Have a suggestion? or should I take it to the shop? Thanks for your help!

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  • Sewing Machines Master
  • 1,388 Answers

If it sounds like metal on metal, it probably is......

Unplug machine, remove all threads and SLOWLY wind handwheel in the normal direction for sewing (usually anti-clockwise for more modern machines)

To locate the collision point, watch carefully at the three possible points for any collision...take the needleplate off to get a better view,...........if you see or feel the point of impact, DO NOT FORCE the handwheel, just note the details.

1. When the two loopers pass. their relative position left and right is critical, as is the distance apart from front to rear....these are not inexpensive to replace, so do this slowly and listen and watch.....this is the most expensive when it goes wrong as you risk breaking one or both loopers.

2. When the Lower looper swings behind the needle/s it may hit the needle, the tolerance here is 0 - .05 mm, so it is really crucial to get it accurate........if there are needle guards involved as well, they also may be hitting the needle.....risk is generally only to needles breaking

3. Least likely.....When the Upper looper passes the needle/s, though the clearance here is far more liberal

The needle bar height is also a crucial factor..as this dictates the relative position for all other movements and timing.

I have just looked through a service manual for a similar machine made by Janome/New Home, and realistically...all in all, without the service manual to refer to and perhaps some specially manufactured guages to get fine settings correct, this is not a job for the novice without someone on your shoulder to talk you through it in my opinion......if you break either or both loopers, that's half the service fee already spent most likely.

As to the other issues, they will all be resolved by a competent service technician in the course of a standard service.... for this one, I think money well spent.

Posted on Mar 15, 2008

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Some sergers require they be threaded in a particular order. If not, they do not "knit" the threads.

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Open the tensions (set at zero). If the tension settings are automatic, raise the presser foot to open the tension settings.

Turn the handwheel so the loopers are at their highest position. There may be a mark on the side of the serger to match up with a mark on the hand wheel for this.

Open the front of the serger and the threading guide should be printed on the inside of the serger door, or on the serger.

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You can find more information and manuals at the Singer Co website.

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Hi,
I have found this info...it mentions both threading and changing the knife width. I hope it is useful.
http://www.singerco.com/pdf/14SH654_threading.pdf

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