Common Faults And Maintenance Of Starter

There are 6 key components inside a conventional starter:

1. The excitation winding generates a magnetic field force to rotate the rotor;
2. the conductive carbon brush is fixed on the casing to supply power to the excitation winding;
3. after the solenoid valve is energized, it shrinks and pulls the driving arm;
4. the driving arm uses the lever principle to push out the starting gear;
5. The torque of the magnetic rotation is transmitted to the engine flywheel;
6. when the start is completed, the return spring will help the drive arm and starter gear to return to their original position.

When the solenoid valve has an internal failure or the drive arm is broken, the starter gear cannot be extended.

The starter gear does not touch the engine flywheel and the engine will not respond when starting the vehicle. But while starting the vehicle, the sound of the starter spinning at high speed can be heard near the engine.

The solenoid valve is installed outside the starter housing and can be replaced independently without disassembling the starter. However, if the drive arm is broken, it is more convenient to replace the assembly.

When starting the vehicle, if the starter motor can drive the flywheel to run, but it is difficult to rotate, the engine cannot be started, or the starter does not rotate at all, and only the sound of the solenoid valve closing can be heard.

This usually means that the starter cannot adequately convert electrical energy into mechanical energy. One of the common reasons for this kind of failure is the poor power supply of the excitation winding caused by the consumption of carbon brushes.

In addition, the virtual connection and ablation of the internal circuit of the excitation winding will also make the excitation effect worse.

If the strength of the magnetic field generated by the excitation winding is insufficient, it is difficult for the output torque converter of the motor to drive the engine flywheel. To replace the carbon brushes individually, just open the back cover of the starter housing, which is easy to operate. However, the excitation winding is damaged, and the operation of replacing it alone is more complicated. It is recommended to replace the starter assembly.

In addition, possible starter component failures include motor rotor shaft fracture, rotor bearing locking, and mechanical damage to the starter gear. These faults can cause problems such as difficulty in starting the engine and abnormal noise from the starter. When the components inside these starters are damaged, the repair recommendation is to replace the starter assembly.

If it is found that the vehicle is difficult to start, the battery voltage of the vehicle should be checked as soon as possible.

If the battery is normal, you need to check the starter and other engine components according to the specific phenomenon of poor starting.