The appearance of a hum, sometimes a whistle in the area of the fastening of the automobile generator indicates wear of the bearings. Replacing these simple parts is not particularly difficult. Relevant work can be done independently.
Dismantling the generator
First you need to disconnect the negative terminal from the battery. Then unscrew the main (thickest) wire from the generator, remove those wires that are thinner from the sockets. Now you can unscrew the nuts that secure the generator itself. On different car models, their number can be different - most often there are two or three attachment points. After removing the generator, it is necessary to dismantle the pulley along with the impeller. To do this, just unscrew the nut with the spring washer, securely locking the pulley. Remove it and carefully remove the key from the groove.
The next step is to dismantle the front cover (on the drive side). Usually it is fastened with several bolts that are recessed into special recesses. You can unscrew them using the socket wrench (to "10" or to "8"). In the next step, you will need a puller with three legs. He is needed to pull out the generator cover. After removing it, remove the spacer sleeve on the axis, remove the generator armature.
