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On M50 engines, do belt tensioners tend to wear out at certain points? My 91 525 has 143,000 miles on it. There is a metallic whirring sound from the front of the engine and I'm guessing/hoping that the noise is as simple as a tensioner gone bad. I don't think that the sound is internal engine noise.
Any ideas?

TIA

edit: forgot to mention that I replaced the old belt with a new.