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General E46 Forum
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Old 12-08-2010, 09:24 PM   #1
TrickTizzle
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wheel bearing/hub question

I need to change my rear trailing arm and will need to remove the wheel bearing in order to release the trailing arm.
So the question is how long does the wheel bearing take to do? I dont want to sit around for 2 days trying to finish the project.
Also if I decide to buy a new hub so I dont have to fucck with the bearing, will the hub have the bearing pre pressed in?
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Old 12-08-2010, 09:43 PM   #2
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Doing the rear wheel bearings was such a PITA. Especially if you are doing the driver's side, you will also have to drop the exhaust. It's not difficult but annoying. Also how do you plan on pressing the new bearing(and then the hub) into place? Do you have BMW's tool? I built my own and it saved me a ton of money. And yes, this can easily turn into a 2+ day project, be prepared. Have all the tools laid out that you will need, that was probably the biggest time waster for me. I constantly needed this tool or that...

Another thing to consider is are these bearings/ hubs etc. original. If you have never had the whole assembly apart it may be a good idea to remove the center cap from your rear wheel, and spray some rust penetrant in there a few days before you attempt this repair to help get things moving. This is what the collar nut over the hub looked like on my rear wheel...







Also, you don't necessarily need a new hub, but it will make things easier and save you time. I assume you are also replacing the bearing while your in there. If your not you should definitely reconsider, for all the work you'll have to go through just to get to it, I'd much rather the peace of mind knowing that there's a fresh new bearing back there. What are you using to get the hub and the bearing out? My hub came off with a slide hammer, but it took some muscle. Also, I would not recommend using the slide hammer to remove the bearing, if it's even possible to remove it that way. I used a press tool I had built myself with some threaded rod bought from Home Depot. Sorry but I never did take a picture of it, but if you want some dimensions etc, I can explain what I used. Good Luck with this one, having the correct tools make all the difference.

Here's some pics from when I did my rear wheel bearings about a week ago...







Hope this helps
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Old 12-08-2010, 09:55 PM   #3
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I honestly wouldn't do the wheel bearings if I had to. I am forced to do it because the hub needs to come out when replacing the trailing arm. The trailing arm replacement is a major PITA on its own so I would leave the bearing PITA to another day...
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Old 12-08-2010, 10:10 PM   #4
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Oh ic, so your planning on leaving the bearing in place while you do the trailing arm replacement. Hopefully that will work for you, but when I pulled my hub out of the bearing it took the inner race with it. So you may end up doing the bearing whether you planned on it or not. Just a heads up...
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Old 12-08-2010, 10:13 PM   #5
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Quote:
Originally Posted by 328ci906 View Post
Oh ic, so your planning on leaving the bearing in place while you do the trailing arm replacement. Hopefully that will work for you, but when I pulled my hub out of the bearing it took the inner race with it. So you may end up doing the bearing whether you planned on it or not. Just a heads up...
The bearing comes out when you remove the rear axle final drive.
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Old 12-08-2010, 10:43 PM   #6
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I'm confused do you mean the axle itself? Don't you need to fully remove it to remove the hub?
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Old 12-08-2010, 10:45 PM   #7
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Quote:
Originally Posted by 328ci906 View Post
I'm confused do you mean the axle itself? Don't you need to fully remove it to remove the hub?
The bentley manual says you need to pull the bearing out to disconnect the axle from the hub.
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Old 12-08-2010, 11:02 PM   #8
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No, I'm sure you could do it that way, but it's way easier to do it the way I described. I followed this DIY...

http://teamdfl.com/bmw/e46/rear_whee...es/Image0.html
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Old 12-11-2010, 10:21 PM   #9
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If you're replacing the trailing arms (for whatever reason) and you plan on reusing your current hubs, then you will need new bearings. This isn't a maybe, it's a definite. The reason you need new bearings is because of the way you have to pull the hubs out and press the bearings out. When you're pulling the hubs you're putting pressure against both the inner and outer races, this damages them. Then, when you pull the bearing from the arm, you again put pressure on both races. If you reuse your old bearings, they will be toast within 5k miles.
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Old 12-14-2010, 07:34 PM   #10
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replacing trailing arm soon. any one want a diy?
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