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Old 01-23-2013, 03:27 PM   #1
ryannel2003
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Rear end noise

Today while I was driving my 323 back from school I noticed a strange noise. Typically the only noise I hear inside the car is the noisy blower motor so I turned that off and it was still making a noise. It seemed to be lessened around 60MPH, got worse at 65-70MPH and when coming to a stop it made the worst scraping noise. When the car is idling it makes no noise at all but in town going 45-50MPH it was also quite loud. Been doing some research and it could be a wheel bearing, cv axle, or even the diff? I had my buddy who is a mechanic ride with me and once the car had sat for 20-30 minutes the noise wasn't as bad as it was before, but it still made noise at lower speeds when the car was rolling.

The car needs diff bushings, a CSB and flex disk. I'm getting all of this replaced in 2 weeks when I get my check in. In the meantime, what is everybody thinking? We're going to put the car on jackstands today and listen for any noise but in the meantime I'd like an opinion as to what it could be. Car has 155k miles on it. Thanks.
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Old 01-23-2013, 03:40 PM   #2
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Is it a metal on metal scraping noise? or a deep on-off drone?
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Old 01-23-2013, 03:42 PM   #3
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When slowing down with the brakes it sounds more like a scraping noise. At speed though it sounds like an on-off drone.
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Old 01-23-2013, 03:43 PM   #4
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When slowing down with the brakes it sounds more like a scraping noise. At speed though it sounds like an on-off drone.
probably a rear wheel bearing
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Old 01-23-2013, 03:48 PM   #5
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This is what my buddy was thinking too. Ive been getting a slight humming noise from the rear end for awhile now but today it was only bad enough to hear it over the radio. Also when I had the car on a lift a few months ago and spun the wheel on that side (passenger side rear) it made a very gritty noise? Drivers side rear sounded smooth.
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Old 01-23-2013, 04:09 PM   #6
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Brakes are possible, but I agree, probably a wheel bearing.
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Old 01-23-2013, 04:11 PM   #7
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This is what my buddy was thinking too. Ive been getting a slight humming noise from the rear end for awhile now but today it was only bad enough to hear it over the radio. Also when I had the car on a lift a few months ago and spun the wheel on that side (passenger side rear) it made a very gritty noise? Drivers side rear sounded smooth.
textbook wheel bearing. let me or trizzuth know if you have any questions. we've done this job. let me tell you... NOT fun
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Old 01-23-2013, 04:20 PM   #8
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Oh great. Well can't say I'm shocked since the car has 155k miles and I'm pretty sure the bearings are original. Are there any special tools needed for this job? Checked a few videos online and it looks like a pain in the ass. I might even pay a shop to do it. F.a.g rear wheel bearings are $30 apiece from BMA so I'll probably get those.
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Old 01-23-2013, 05:12 PM   #9
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Oh great. Well can't say I'm shocked since the car has 155k miles and I'm pretty sure the bearings are original. Are there any special tools needed for this job? Checked a few videos online and it looks like a pain in the ass. I might even pay a shop to do it. F.a.g rear wheel bearings are $30 apiece from BMA so I'll probably get those.
yeah you need quite a bit of special tools. a shop charges roughly $500-700 per side
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Old 01-23-2013, 05:24 PM   #10
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Jeez that's quite a bit. I'd rather try and get it done myself than pay that kind of money! I'll try and view some DIY's and get more knowledgeable about it.
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Old 01-23-2013, 05:30 PM   #11
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I replaced the rear bearings myself 2 years ago and I can tell you that it was pita, great thing that I made up some of my own tools and be able to finish the job, but it took me 6+ hours (not including time for making tools), at first I wanted to let the shop handle the labor but the cheapest labor I could get was $220 per side, so I decided to replaced them myself.

However, front wheel bearing replacement is a piece of cake.

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Old 01-23-2013, 05:51 PM   #12
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Jeez that's quite a bit. I'd rather try and get it done myself than pay that kind of money! I'll try and view some DIY's and get more knowledgeable about it.
Well, if you are mechanical incline, you probably could do it, otherwise, you could mess it up really bad and end up costing more to have someone finished it afterwards.

So if you're not sure or feel confidently that you could do it, it's better to pay someone to do it for you even it's not cheap.
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Old 01-23-2013, 05:53 PM   #13
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check trizzuths thread. all you need to know. i posted what you need in there
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Old 01-23-2013, 07:09 PM   #14
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Sweet deal. Ended up getting car on jacks an putting it in drive and you can clearly hear its a wheel bearing. The wheel itselfs wobbles too so I'm parking it until I get the bearings. I have my friend who is gonna help me along with getting my rear diff bushings and csb/guibo done too. Question though... After we dropped the car down the ABS and DSC lights came on and won't turn off. Do I need to disconnect battery to reset?
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Old 01-23-2013, 07:17 PM   #15
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^ No, it will reset itself after you drive the car.
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Old 01-23-2013, 07:20 PM   #16
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Good deal. Appreciate the help guys!!
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Old 01-23-2013, 07:28 PM   #17
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Change both sides for the bearings since they are difficult to pull off. Might as well get it done in one shot. I learned the hard way by doing one at a time. just my suggestion

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Old 01-23-2013, 07:30 PM   #18
ryannel2003
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Oh yea gonna order both F.A.G wheel bearings from BMA. $70 shipped for 2.
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Old 01-24-2013, 04:55 PM   #19
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You might consider replacing the "dust shields" around the back rotors when you do the bearings. The parking brake locator pins mount to the dust shields, and on my 2000 323i the pins pulled through the rusted shields. You have to take the hub/bearings out to mount the oem shields, and they are cheap to buy and replace while you are doing the bearings. On my car, the e-brake shoes fell apart inside the rotor wreaking all kinds of havoc and making all kinds of noise. At least look at the shields when you are doing the work on the bearings.
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