You can download an instruction manual for Singer machines from here http://www.singerco.com/accessories/manuals.html, just type in the model number and click "search".
This sounds more like top thread is not in tension though so have you checked tension is working okay?
However, to adjust timing you will need a service manual or general instructions for a horizontal hook sewing machine. You may find a video that helps with this on You-tube, I just leave it to the experts.
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