Car Alternator Bearing Makes Grinding noise?

The rotor inside the alternator rotates on bearings, normally very high precision needlebearings, and these can fail. When they do you will hear a loud grinding noise.

This is how this bearing looks:---

If this bearing is worn out,then it has to be replaced.On some car models the bearing can be replaced.But if alternator itself is worn out then replace it as complete assembly.

Before replacing alternator,its always advisable to inspect,test and then replace alternator.

The topics mentioned below,with help you to confirm the alternator problem.

How to inspect Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html

How to Test Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html

How to Service Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html

How to Replace Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html

How to monitor Vehicles charging system?

http://repairhelpcenter.blogspot.com/2011/11/how-to-monitor-vehicles-charging-system.html

Car Alternator making noise?

http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html

This details will help you.

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If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.