[s-cars] bearing rumble

[Martin, Gary G]

My bet is wheel bearing. Especially since the noise changes when you
change direction. My 200 did this. Turning the wheels by hand, no noise
was apparent. You'd be surprised how a tiny defect in the bearing
surface can make so much noise. 

Gary

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Jerry Scott
Sent: Saturday, November 29, 2003 2:30 PM
To: s-car-list
Subject: [s-cars] bearing rumble


I saw an earlier post that had the same problem as my car, but can't
find it, so here goes.  This is definitely a front of car, drive line
noise and not engine related.  Normal 60 mph driving produces a low
frequency bearing rumble that sounds almost like a tread buzz on
aggressive snow tires.  Since my tires are m+s with a very small tread
block, I know it's not the tires.  It has gotten progressively worse
during the last 3000 miles and is aggravated by turning to the the wheel

to the right at road speed.  Turning to the right seems to make it more
pronounced.  I have checked the boots on all four front CV joints, which

look fine with no tears or leaks.  Jacking up the front wheels and
spinning the tires does not produce any noticeable axle bearing or CV
joint clicking.  My first thought was that it was a wheel bearing going,

but laterally pulling on the front wheels shows no play or roughness, at

all.  The sound seems too low to be the usual trany main shaft bearing,
but could it possibly be the  output axle bearings for the trany?  It
also could be the center drive shaft bearing, but sound more like it is
in the front of the car rather than mid-car.  Any advice would be
appreciated.
Jerry Scott
early 93 S4


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