My guess would be front wheel bearings (did they put in new races?
If not, the old ones eat the new bearing very fast, BTDT). Tires are
also a possibility, but that noise varies with road speed almost always.
Yes, there is a bearing in each wheel carrier in the rear, and yes
they can make noise.
Also check for things like a bad belt or a fan rubbing on the shroud,
or dead engine mounts allowing something to rub, like hoses.
Peter
On Apr 24, 2009, at 3:44 PM, WILTON wrote:
Have you jacked up a front wheel and spun it by hand while
listening closely and feeling for "roughness?" Nearly fifty years
ago, I could confirm a bad wheel bearing in this manner, but as I
said, I haven't done it a "while."
Wilton
----- Original Message ----- From: "andrew strasfogel"
<astrasfo...@gmail.com>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Friday, April 24, 2009 4:33 PM
Subject: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear
or justfront?
My 83 W123 300TD makes a peculiar sort of moaning/wowing noise
above 45 mph
that doesn't vary in pitch with the speed of the car. I had the
front
bearings replaced 6 months ago (both sides) but this noise sounds
as if they
are shot again. So here are my questions:
1) Could this be road noise from the front tires? The tires look
fine, the
steering wheel is solid, and there is no shimmying. .
2) Could the noise actually be coming from worn REAR wheel
bearings? Are
there bearings in the rear that must be replaced when worn out?
This is NOT
the whining noise made by a worn out rear axle
3) Any other possible sources of the noise? In an earlier
experience (a
different 1983 300TD), the defective bearings made their racket at
low
rather than high speeds and this noise was a lot more obnoxious
IIRC than
what I am hearing now...
4) Would it make sense to swap the front and rear tires to see if
that makes
a difference?
Andrew
1983 300TD
1985 300CD (doesn't moan)
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