In my 2004 Z4 with 48,000 miles. I just noticed that when the engine is first started that there is an intermittent whining or squeaking sound. It sounds like its coming from the rubber belt area at the front of the engine near the top - I believe. It might be the belt tensioner? I don't think it’s coming from alternator which sits much lower.
Is there a way to isolate the sound? If it is the belt tensioner, why would it be making noise? Can it be lubricated with grease?
Any suggestions.
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Squeaking sound under hood when engine is cold
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Z4-04
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Squeaking sound under hood when engine is cold
2004 BMW Z4 3.0i Roadster, sapphire black, Oregon beige interior
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ph001
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Squeaking sound under hood when engine is cold
Length of hose - one end to your ear, the other to the various spinny bits. The bearings have a finite life on the tensioners and all the other pulleys for that matter.
2007 E85 Z4 3.0Si manual 
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby
2004 E46 M3 coupe manual - gone but not forgotten.
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby
2004 E46 M3 coupe manual - gone but not forgotten.
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Z4-04
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Squeaking sound under hood when engine is cold
I actually determined that it is the tension roller next to the alternator. It appears to be a reasonable job to replace it.
Thanks
Thanks
2004 BMW Z4 3.0i Roadster, sapphire black, Oregon beige interior