how to fix a speedometer that is off

• 2022-07-22

Common faults and adjustment methods of speedometer. The car speedometer and odometer are integrated, and the common faults and adjustment methods are as follows.

How to fix a speedometer that is off:

1.The reason for this type of failure is usually that the flexible shaft or casing of the speedometer is bent, and the flexible shaft scrapes with the casing when it rotates; the bearing of the speedometer speed disc shaft is worn and loose, which can also cause the pointer to swing during operation. When performing fault detection, it is necessary to remove the flexible shaft and casing first, and check whether the casing is bent or flattened. If the above phenomenon occurs, it should be repaired or replaced according to the degree of damage. If the casing is in good condition, pull out the flexible shaft, hold both ends to make the middle part sag, and turn the flexible tube by hand. If the above inspection shows that the flexible shaft and the sleeve are normal, the speedometer should be disassembled, the speed plate bearing should be checked, and if the bushing is found to be worn, it should also be replaced.

2.Speedometer needle does not move

This kind of fault may be caused by two situations. One is that the speedometer itself is normal, and the fault is in the transmission part of the speedometer. It may be that the speed disc shaft is broken, the shaft end is severely worn, or the speedometer hairspring is damaged; the second is that the odometer drum does not rotate , indicating that the driving parts of the speedometer and odometer are damaged, usually the flexible shaft is broken or the driving gear is damaged. After further disassembly and inspection, it can be found that the damaged parts should be replaced.

3.The speedometer works fine but the tachometer drum does not turn

This kind of failure indicates that the transmission gear from the drive shaft of the speedometer to the first character drum is damaged and cannot drive the character drum to rotate. It should be disassembled and inspected, and the damaged character drum gear should be replaced.

4. The magnetic force of the magnet in the magnetic speedometer is degraded, which will cause the pointer indication value to be inaccurate, and the magnet should be replaced.