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      04-19-2018, 06:50 PM   #1
Lashko
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xDrive Front Wheel Bearing Question

Replacing both of my front wheel bearings on my 335xi. I pressed in the bearing and hub successfully, but then realized after I pressed the hub in that I forgot the dust shield. Does anybody know if its necessary to install the dust shield?
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      04-19-2018, 09:51 PM   #2
bennye90
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Purpose of the dust shield is in its name. Keeps the debris and heat away from the suspension components and vice versa. It up to the owners preference if they want it there or not. I've seen owners butcher their dust shield to fit brakes, install different hubs, adjust to stance, etc.

No direct correlation between suspension component service life with dust shield vs no dust shield.

Looks like you got the bearing in with no issues. Congrats.
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      04-19-2018, 10:08 PM   #3
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Quote:
Originally Posted by bennye90 View Post
Purpose of the dust shield is in its name. Keeps the debris and heat away from the suspension components and vice versa. It up to the owners preference if they want it there or not. I've seen owners butcher their dust shield to fit brakes, install different hubs, adjust to stance, etc.

No direct correlation between suspension component service life with dust shield vs no dust shield.

Looks like you got the bearing in with no issues. Congrats.
Thank you for the help. I’ve already took out the hub, unfortunately I am going to have to replace the bearing again because part of it is attached to the hub now.
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      04-19-2018, 10:12 PM   #4
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Quote:
Originally Posted by bennye90 View Post
Purpose of the dust shield is in its name. Keeps the debris and heat away from the suspension components and vice versa. It up to the owners preference if they want it there or not. I've seen owners butcher their dust shield to fit brakes, install different hubs, adjust to stance, etc.

No direct correlation between suspension component service life with dust shield vs no dust shield.

Looks like you got the bearing in with no issues. Congrats.
Question for you... I removed the new bearing from the knuckle and noticed that it left a lot of scratches on both the knuckle and bearing. When I pressed out the original bearing I did not have any scratches. Should I worry about this?
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      04-19-2018, 10:21 PM   #5
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Quote:
Originally Posted by Lashko View Post
Question for you... I removed the new bearing from the knuckle and noticed that it left a lot of scratches on both the knuckle and bearing. When I pressed out the original bearing I did not have any scratches. Should I worry about this?
Pictures would help. The bearing would need to be pressed into the hub and have no play in it.
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      04-19-2018, 10:23 PM   #6
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Quote:
Originally Posted by bennye90 View Post
Pictures would help. The bearing would need to be pressed into the hub and have no play in it.
They’re very small scratches. Not deep at all. I will take pictures tomorrow morning.
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      04-20-2018, 12:13 AM   #7
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Late to the party. Otherwise i would say leave it. It is going to cost you a bearing then let dust do it, if it even does.

Small scratch probably dirt caught in there? Should not be a big deal.

Btw not sure if you need to use some oil or grease.
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      04-20-2018, 12:15 AM   #8
labrador
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Just curious how difficult was it to get the bearing out?

I let machine shop press them so am curious for DIY.
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      04-20-2018, 12:17 AM   #9
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Quote:
Originally Posted by labrador View Post
Just curious how difficult was it to get the bearing out?

I let machine shop press them so am curious for DIY.
I used a 12-ton press from Harbor Freight and it removes the bearings like a hot knife through butter.
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      04-20-2018, 12:20 AM   #10
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Oh wow 😮!

Thanks!
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      04-20-2018, 12:36 AM   #11
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Originally Posted by labrador View Post
Oh wow 😮!

Thanks!
Although I've had trouble with the knuckle. It is such an odd shape and it won't stay level to the ground. It's a PITA to keep her balanced and steady on the press.
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