How to Fix the Timing on a Singer Serger
The timing of a Singer Serger sewing machine gets thrown off for different reasons. The timing gets damaged when clothes are sewn that are too thick. Improper cleaning of the machine is another culprit. These kind of issues cause the internal parts of the machine to move away from their proper position.
Adjust the needle depth. Take the bobbin out of the case. Place a new needle into the needle bar and then place the needle on the lowest position with the handwheel. Observe the hook assembly from the front of the sewing machine. The whole eye of the needle should be visible if it the correct depth.
To adjust the needle depth, use a long, flat screwdriver to loosen the screw that holds the needle bar in place. Some machine models require the front cover to be removed to access the needle bar's screw.
Change the needle bar height so that the entire eye of the needle is visible/ This will ensure that the needle is at the correct depth.
Check that the hook rotates properly. Place the needle bar in the lowest position and observe the notch in the back of the needle. The notch is called a scarf. As the needle moves upward, the pointed part of the hook should move past the needle in the middle of the scarf.
If the hook's rotation must be adjusted, turn the hook right and left on the shaft. Loosen all three of the large screws that secure the hook to the rotating shaft. Twist the shaft while holding the handwheel and needle still. After the hook has been observed to rotate properly, tighten only one set of the screws that have been loosened.
Use a magnifying glass to look for space between the point of the hook and the needle. If the clearance isn't properly set, stitches will be missed or skipped.
To decrease the amount space between the hook and the needle, pull the hook forward and closer to the needle. Use a small screwdriver to do this, because fingers are too large to manipulate the hook properly.
If the hook touches the needle and bends it, the hook must be pushed backward using a screwdriver away from the needle so that it slightly pushes against the needle.
Use the magnifying glass to check the position of the needle and hook again. Make sure that the needle and hook clearance is the only thing adjusted and that the rotation isn't affected. Tighten the final two hook set screws loosened in step 2. Each screw can only be tightened a small amount at a time to avoid damaging the hook mechanism. First, tighten one screw a very small amount. Next, tighten the other screw just a little. Repeat this process multiple times until the screws are tightened.
Make adjustments to the finger that retains the hook. The hook-retaining finger is supposed to jut toward the notched portion about one-third of the way in, leaving just enough space to stop the bobbin basket from rotating.
If it's necessary to adjust the hook-retaining finger, loosen the single screw that holds the finger in place, which is located underneath the throat plate in the front of the machine. Slide the hook-retaining finger into the correct position. Tighten the screw. Observe the finger to make sure that there are no jagged edges that may slice the thread.
Manually turn the flywheel to check the results of the timing corrections made. Confirm that the timing has been corrected and stitches are properly formed. Make sure the clearance is correct and the retaining finger is in the correct position.
Things You Will Need
- Small flat screwdriver
- Magnifying glass
- Making modifications to a Singer Serger may void the manufacturer's warranty.