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      01-23-2013, 04:44 PM   #1
Manny_World
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Whining Alternator

Recently, my alternator have started to whine at 2k rpm and the volume of the whine follows the rpm. From what I've read and heard is that it's the alternator clutch going out and it needs to be replace. Is there anyone out there that just replaced the clutch or do I have to replace the alternator as a whole? If so, where can I find the part? I've found the installation kit but not the clutch. Thanks in advance!

Update: Video!!!!
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Last edited by Manny_World; 01-25-2013 at 06:55 PM. Reason: Video uploaded
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      01-23-2013, 10:40 PM   #2
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Subscribed, do you hear a whine 1500 to 2000 rpm?
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      01-23-2013, 11:16 PM   #3
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Yep, there where it starts to whine.
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      01-24-2013, 10:56 AM   #4
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any video or sound to show so we can all look out for?
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      01-24-2013, 11:03 AM   #5
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Not saying this is the culprit but there was a whining noise coming from my fiancee's 328i that increased as the RPM's increased and it ended up being her rear diff going bad.
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      01-24-2013, 11:11 AM   #6
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any video or sound to show so we can all look out for?
I'll record a video and post it when I get home.
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Not saying this is the culprit but there was a whining noise coming from my fiancee's 328i that increased as the RPM's increased and it ended up being her rear diff going bad.
It definitely coming from the alternator. I wish it was the diff, it'll make easier to justify a WaveTrac quicker to my wife, lol.
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      01-24-2013, 12:29 PM   #7
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The alternator contains an overrunning clutch (sprag type?) that allows it to spin freely as the engine winds down and only applies torque in one direction. I've seen a couple cases where they fail and make more of a ticking noise, but I suppose they could whine if they seize.
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      01-24-2013, 05:30 PM   #8
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You sure it's not the power steering? They are notorious to fail more so then the alternator.
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      01-24-2013, 06:03 PM   #9
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You sure it's not the power steering? They are notorious to fail more so then the alternator.
I'm 120% positive. Had friends to listen to it and an indy shop. Everyone quickly points to the alternator. It whines without the wheel turning.
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      01-24-2013, 09:59 PM   #10
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i have the same issue and its annoying as hell, hate to change the alternator though.
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      01-24-2013, 11:13 PM   #11
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If your looking for an option beside BMW oem replacement part, Bosch does sell repair kits. Not sure if they have kits for the new cars , but I have rebuilt a handful of E46 and E39 alternators.
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      01-25-2013, 06:56 PM   #12
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Quote:
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any video or sound to show so we can all look out for?
Video just uploaded in first post.
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      01-25-2013, 11:58 PM   #13
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Quote:
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Video just uploaded in first post.
Interesting how many miles? i have a whining sound as well, but nothing like yours.
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      01-26-2013, 12:34 AM   #14
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Interesting how many miles? i have a whining sound as well, but nothing like yours.
Just hit 76k, but it started at 75k being a hit or miss issue... now it's constant.
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      01-29-2013, 11:49 PM   #15
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Quote:
Originally Posted by Tzu View Post
The alternator contains an overrunning clutch (sprag type?) that allows it to spin freely as the engine winds down and only applies torque in one direction. I've seen a couple cases where they fail and make more of a ticking noise, but I suppose they could whine if they seize.
Do you know of any places where I could buy just the overrunning clutch?
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      03-13-2013, 08:43 PM   #16
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My car is making this EXACT sound. Its so annoying. My 335i has 77k miles . I also dont want to replace the alternator to get rid of the noise.

Have you changed it yet?
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      03-13-2013, 09:00 PM   #17
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Say it's diff and replace both at the same time
R
Also on one my mustangs I had upgraded output alt and it started to wine...... Turned out the long screws / bolts that hold it together loosened, tightened them up and it was gone. I haven't looked close at ours but might wanna check them
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      03-13-2013, 09:25 PM   #18
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My car is making this EXACT sound. Its so annoying. My 335i has 77k miles . I also dont want to replace the alternator to get rid of the noise.

Have you changed it yet?
Haven't changed it. When I was about to, it stopped . Either my exhaust drowning it out or I've gotten use to it. I'm going to a meet tonight, I'll open my hood and have someone give it some gas.
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      03-13-2013, 09:38 PM   #19
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I'm pretty sure this clutch you're talking about is built into the pulley. You can purchase the pulley separate but also need a removal tool. Ecstuning has a couple tools on their site.

If you only hear the whine through your radio then I think it's the internal alternator parts that need to be changed and replace the entire alternator.
It's it more of a screech ? Like metal on metal?
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      03-13-2013, 09:45 PM   #20
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I'm pretty sure this clutch you're talking about is built into the pulley. You can purchase the pulley separate but also need a removal tool. Ecstuning has a couple tools on their site.

If you only hear the whine through your radio then I think it's the internal alternator parts that need to be changed and replace the entire alternator.
It's it more of a screech ? Like metal on metal?
Definitely not coming through the radio. Sounds more like a screech. The sound starts in the video around 0:37 seconds. I saw the tool on a few sites, just not the clutch.
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      03-13-2013, 10:29 PM   #21
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I have a spare pulley , had to order it through tischerbmw since it has to come from Germany.its not a common part number.

Never put it on but I've got everything ready to do it.
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      03-14-2013, 08:23 AM   #22
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My car is making this EXACT sound. Its so annoying. My 335i has 77k miles . I also dont want to replace the alternator to get rid of the noise. If you want to try to do the clutch instead of the full alternator swap, PM Rotorcious

Have you changed it yet?
Yep, mine stopped. Not sure what cause or cured it... but glad it did.
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I have a spare pulley , had to order it through tischerbmw since it has to come from Germany.its not a common part number.

Never put it on but I've got everything ready to do it.
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