Bad Wheel Bearing!!!! Need Info. - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 12-03-2004, 09:15 AM
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Ok so I own a 1998 528i. I'm hearing a mild to medium rumbling sound when I'm driving straight and turning left, however when I turn right the sound goes away. A friend of mine who's a mechanic said it sounds like my right front wheel bearing is going out.
Ok so I went online and was going to purchase bearings for both sides, what the hell if your going to do one side you might as well do both right? Any how when I went online all the sites sell wheel bearings for the rear, but I don't see anything for the front. Are they the same part???
The only thing I could find with regards to the front is the front "Wheel Hub Assembly".
If anyone has experience with this your info. would be much appreciated.

Thanx
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#2 (permalink) Old 12-03-2004, 10:20 AM
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Hi,
The front and rear wheel bearings are different. You were correct in finding that the front wheel bearing is in fact the hub, it is all 1 assembly. I am attaching a link to a diagram from http://realoem.com the wheel bearing is #5 in the picture (part # 31221093427) and also be sure that you replace the 4 bolts which hold it on, the bolts are listed below the bearing (#6 in the picture)

Also since they are not exactly cheap you may want to make sure that this sis not a tire noise before you start replacing bearings. Did you lift the front of the car and spin the wheels without the etires on the ground to confirm mthe noise? If not I would spend a few minutes doing that 1st. Also a real good tests is to spin the wheel and while it is turning grab the spring and feel to see if you can feel any roughness. If the bearing is fine it should feel nice and smooth, if the bearing is bad you wil feel the roughness of the bearing through the spring.
Hope this info helps, Good luck

DT

link to diagram

DT




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#3 (permalink) Old 12-03-2004, 03:24 PM
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Kanestron:

If it turns out to be wheel bearings...

I've read a lot of good reviews about Zechhausen Racing. From what I have researched on their site and forums, they seem to have the best pricing and reputation.

Not tried them yet but plan to soon.

BTW - Nice advice Dirty Tool, you taught me something. Thanks!

Jim

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#4 (permalink) Old 12-03-2004, 03:55 PM
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I repllaced my left rear wheel bearing this summer, after it began squeaking. There was no need to replace both.

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#5 (permalink) Old 12-03-2004, 04:39 PM
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I did the change 4 of them, the two hubs in front held by 4 bolts from the back where I replaced by new bolts from BMW (they come coated with thread locking compound see DT's remarks above). Difficulty? I say medium because one the bolts is hidden behind the strut nuckle (turned otherwise 1/2 job to 1 hour)

The back ones are NOT hubs and tend to live over the rear small shaft. I used a bearing puller to get them out, they did get separated though from the inner ring (they came off in 2 pieces/inner stuck to the shaft) but it was easier than the front ones. Once replaced the car will role way much better.

good luck
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#6 (permalink) Old 12-04-2004, 12:46 PM
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Coincidentally enough i was browsing www.bmwtips.com and came across this link written by DaveZ. It has a really nice DIY with great pictures and step by step instructions also part #s which we already covered but the pics of the parts are much much clearer than the parts diagram which i posted for you. Im sure this will help out a lot if you're gonna do his job yourself.

DT

http://bmwtips.com/tipsntricks/DZ/bearing.htm

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#7 (permalink) Old 12-06-2004, 03:27 PM
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Thanks for all your help fellas. I have the hub ass. on order and will be recieving it soon. I think I'll tackle this one myself, it looks pretty straight forward.
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#8 (permalink) Old 12-22-2004, 06:11 PM
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I'm about to take on this ordeal soon as well, mines a 325i conv.
nice advice dirty tool, the spring test is very easy, and your right, the driver side feels like the wheels not even spinning, yet the passenger side(same symptoms of the 1st thread) and the spring has a slight vibration...

all in all i phoned around and some suggested i replace the strut w/hub assembly.

seemed to take 15min. to remove at the junkyard, ill let ya know what happens going back in.

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