[Surly73]

I have a 2007 E90 328i w/ 6MT (should be the 140A alternator since I don't have AT).

It's making a whine most noticeably heard bouncing off of curbs and walls at 1500-2000 rpm - high pitched, consistent with the small pulley installed on the alternator, sounds like an old-school turbo.

I'm having trouble convincing my third part warranty (up in 2 weeks) that there's actually an issue since the mechanic I'm using (I usually DIY everything but need to extract value from this warranty) can't adequately demonstrate a problem that the assessor really thinks is a problem.

At any rate, I'm not sure that it's bad enough to throw away the whole alternator as opposed to replacing the bearings and brushes and buttoning it back up myself.

I had DIYs and parts lists for past bimmers, but haven't really seen anything for the E90.

[mrjoe]

you can get it done for around $85-$100 at a specific shop. google for your nearest area.

[Surly73]

Originally Posted by mrjoe

you can get it done for around $85-$100 at a specific shop. google for your nearest area.

Yeah, but

1/ I like to DIY

2/ this is my only car available to me. I can't drive the alternator to the shop with it out of the car.

[4EST]

actually, you CAN drive the car for some time, only using the battery