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535ix Bad Alternator Bearing?

Old 02-06-2018, 08:00 PM
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Location: New Mexico
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My Ride: 535ix, wifemobile, stock
Model Year: 2011
Default 535ix Bad Alternator Bearing?

I've been noticing some sounds that I can't pin down in my wife's 2011 BMW 535 ix with 107k miles. The best way that I can describe it is that it's kindof a whirring sound that follows the RPM band.

I listened to the alternator with a stethoscope with a rod on the end (backyard mechanics oscilloscope) and it does sound like the bearing in the alternator may be dragging a bit. There are also a few rattles at low RPMs between 1,000 and 1,800rpms.

I uploaded a video of the sound through different rev ranges. Has anyone here had a similar problem?


Thanks for reading/helping.
mattoh is offline  
Old 02-08-2018, 04:52 PM
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Sounds like a bearing on the alternator.
bmwmonkey is offline  
Old 02-08-2018, 06:17 PM
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Is that replaceable separately from the alternator or do I have to buy a new alternator?
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Old 02-09-2018, 01:21 AM
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Engine: 3.0 M54
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It's replaceable only if you know how to rebuild an alternator if not then you will have to buy one.
seanjordan20 is offline  
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