People often ask why the engine can be started by taking a starter to make it work/tap starter motor with hammer/tapping the starter to start the car and other methods when the starter does not respond when the engine starts?
If the starter needs to tap a starter to make it work to start the car, in most cases it is caused by poor contact between the carbon brush and the rotor copper head (commutator). For example, if the length of the carbon brush is shortened due to excessive wear, it can be repaired by removing the engine and replacing the carbon brush.
Therefore, in this case, just replace the new carbon brush to solve the problem.
You can check the Automotive starter diagram to replace brushes or electromagnetic switches.
automotive starter diagram
Stuck starter solenoid issues can also lead to issues such as taking a starter to make it work/tap starter motor with hammer/tapping the starter, How to handle similar issues?
Replace the starter switch.
starter solenoid how it works
The electromagnetic switch can be disassembled, and the contact terminal surface, moving iron core, and copper tube can be cleaned to eliminate sticking points and burrs, which can solve electromagnetic switch faults.