I just got the timing belt service done on my BMW (85-325e). (4 year or 50K mile service)

My question is, is it normal for the new belt to have a whine to it?  Its not loud, but I could notice it. The best way I could describe it is it sounds sorta like a supercharger belt whine.

Thanks,
Bob

I've heard it before. Usually the belt is adjusted a bit tight and will stretch a bit and quiet down. Should be gone in a day or two. Your mileage may vary [;)]

Your concern is normal and your mechanic is trying to compensate for a bit of break in. You and your BMW should be fine.

Not to be the pessimist, but the timing belt on my '84 Honda whined for a few hours after it was replaced — until I popped the hood and noticed that it was eating its way out of  the belt cover! Seems they hadn't quite gotten the tension right the first time —

Isn't it usually recommended to replace the tensioner along with the belt? Not much extra expense beyond the parts cost of the tensioner itself, while your in there...

Not usually they don't replace the tensioner.
The other problem is they may not have tightened the tenisioner back down correctly. It could be walking off and rubbing. After it is cold, start it and let it run for a couple minutes. Not enough to heat the engine up, and touch the cover and see if it is hot. If it is go back and have them check it again. Or if it stops in a little while it could just be what Rifleshooter said.

Thanks for the info.. I will keep an eye on it..