Threading a Singer sewing machine is more complicated than threading a needle. There are steps that need to be followed, otherwise the thread will constantly break or have difficulty creating stitches at the necessary tensions. The Singer 327 machine can do much more than standard stitches. It also is capable of embroidery and other decorative stitches. Threading the needle is a snap, with the integrated needle threader. If you notice your thread is breaking a lot or the tension is not good, check the thread path. You may have missed a spot when threading the machine.
Turn off the machine. Rotate the hand wheel toward you, until the needle is at its highest position.
Make sure the presser foot is up. If it is down, then raise the foot up.
Pull the end of the thread from the spool through the first slot of the thread guide. Insert the thread through the second slot of the thread guide. The thread forms a right angle through the thread guide.
Run the thread down under and between the tension discs, found at the lower parts of the machine. You will notice a knob located above the foot and needle; this contains at least two discs. Draw the thread through the tension guard located above the discs.
Lop the thread under the take-up spring, located on the left side of the tension discs. Run the thread up over the eye, found above the extension discs. These steps allow you to thread from the back to the front. If you have difficulties performing this task, then thread the eyelet on the take-up lever, as you would if you were threading a needle.
Run the thread through the arm-thread eyelet and the needle clamp thread-guide, located just above the needle.
Thread the needle from the left to the right. Pull, at minimum, two inches of thread through the needle, before you start sewing.
The Singer company provides threading diagrams for those individuals that have trouble properly threading their machine.