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Got an annoying pulley whine on my e91. More noticeable in when revving it up. It’s the older m47 engine. Is there a common pulley that goes first on these engines? Idler? Alternator? Crank pulley etc?
 

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I had a whine going on with my e90 330d where it turned out it was a failing water pump bearing. The whine I had increased with engine revs and sounded slightly supercharger like.

Having changed the water pump it stopped immediately. The old pump was original and about 110k old. The bearing was loose. I wonder if its the same whine you're suffering with.

All the best
 
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