Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
User Name
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management

LinkBack Thread Tools Display Modes
Old 04-01-2019, 11:46 AM
Join Date: Apr 2014
Location: Vancouver BC
Posts: 358
white46 is on a distinguished road
Thanks guys for your input.
I just swapped from winter wheels to summer. I'll keep you updated how the sound changes.
Reply With Quote

Sponsored Links

Old 04-01-2019, 02:32 PM
andrewwynn's Avatar
Join Date: Jun 2015
Location: Racine, WI
Posts: 5,467
andrewwynn is on a distinguished road
2003 4.6is, up on lift, should all 4 wheels spinning?

Also: a firm constant turn will usually change the tone of the bearing hum. Unfortunately left vs right turn is not a key to the change. (eg, left turn pushes more force on the outside tires) but it can flip the bearing race either way since you can't be sure if the outer or inner race is the up or down push unless by experiment you've determined.

In my case I know that 235 tires with my wheels will torque the top of the wheels out and my 255 tires/wheel combo torques the top of the wheel in (so the 235s push down on the outer race and up on the inner race, the 255s the opposite). I've gone from silent to full blown roar when going from 255 to 235
And recently went from annoying but can't tell which corner to 5-8 dB louder in the right rear corner (annoyingly a bearing I've replaced in the past).

I use the app FFT to measure the sound snapshot while holding the phone against the inner wheel well on each side of the car. I hold the phone against the plastic trim of the trunk cover to get a sound short.

It's amazing how much more obvious the measurements are compared to what you hear. So many of the frequencies just bounce off everything and sound like they are coming from every direction.


That's the iPhone version of the app. Priceless utility for finding strange sounds. Works with the inline mic on your earbuds also to help location finding.

One of the very first things I found was a leaky shop air hose. I heard a crazy high frequency whistle and of course it bounced off everything so I couldn't locate it. Using fft and sweeping around with the phone a 10 or 12kHz sound was obviously centered at a hose fitting. Added some thread tape and resolved in a couple minutes.
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
Old 05-09-2019, 06:34 PM
Join Date: Apr 2014
Location: Vancouver BC
Posts: 358
white46 is on a distinguished road
Just for update.
After swapping winter to summer wheels, didn't make any changes to ruh-ruh-ruh sounds from fronts.
Took it to shop and verified the sounds are from front wheel bearings.
Since front ball joints are due as well, it is good time to tackle both together.

So I gave it to shop. ha....
There are few things just not worth my effort and time. Rather pay someone to take over possibly huge stress job.

Bought new front ball joints, bearing, lock ring, dust cover, hub nut and even Drive hub. Gave all to the mechanic.
Paid $540 CAD for labor, which is about $400 USD. Totally worth it.
The car drives butter smooth now.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 05:10 AM.
vBulletin, Copyright 2020, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.