Originally Posted by
scirocco16v
I'm not quite sure what the "out of round" sound is still. Bearing noise? M-B alternators are pretty tough. When they do fail it's usually the voltage regulator. Depending on how sensitive your hearing is, you may just be hearing engine harmonics. Is it at idle and audible in the cabin? Like a high pitched whirring or fluttering noise?
scirocco: the sound I'm referring to is like a fluttering noise , heard clearly at idle...it can be heard in the cabin also. When the rpms are increased (even slightly) I cannot hear it...The sound comes and goes, in other words it's not constant.. One of the parts stores (Advance Auto), said it sounded like a worn serpentine belt... checked the belt and the grooves are rather deep... car has 106,000 miles...regardless, the belt does need changing... This condition has existed for about 4 months, and it does not appear to be getting appreciably worse...Your thoughts?..Carl