Question about 2001 BMW 325
From what you describe, the first step i would recommend is removing the aux belt that runs the alternator, power steering etc and check all the pulleys for wear or noise if ok then run the engine, but only for a few seconds to see if the noise is still there. if it is i would then remove the front timing cover and check all the pulleys for wear. every pully should be perfectly silent and smooth when turned by hand, the slightest noise would be exagerated when the engine is running. if they all check out ok it could well be a cam shaft problem. that can be checked by removing the cam cover and you should be able to do a visual inspection on the cam shaft, there should not be any scores on the lobes. let me know how you get on or are unsure about anything, just a point if a belt has been running to tight it will very quickly damage a pulley bearing resulting in a whirring or rumbling noise.
Posted on Nov 01, 2008
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