Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear, or justfront?

[andrew strasfogel]

No, but I fail to see the possible connection.  The noise sounds like it is
coming from beneath the engine, not on top.  Anyway, that's easy to check.

On Sun, Apr 26, 2009 at 9:16 AM, MG  wrote:

> What you never go faster then 40 or so in curves? It must be a ton of fun
> to be caught behind you when you drive.
>
> If the sound doesn't change with different road surface conditions it isn't
> tires. Have you checked the mounts for the airfilter.
>
> Manfred
>
>
>
> Date: Sat, 25 Apr 2009 09:53:53 -0400
> From: andrew strasfogel 
> Subject: Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear
>orjustfront?
>
>
> It's only heard at speeds in excess of 45 mph, so that would be slightly
> dangerous...
>
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Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear or justfront?

[WILTON]

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" 

To: "Mercedes Discussion List" 
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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Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear or justfront?

[Peter Frederick]

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"  


To: "Mercedes Discussion List" 
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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Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear or justfront?

[andrew strasfogel]

Aha - hadn't thought of these - thanks!

On Fri, Apr 24, 2009 at 8:56 PM, Peter Frederick wrote:

> 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" 
>> 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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>>>
>>> To Unsubscribe or change delivery options go to:
>>> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>>>
>>
>>
>>
>> ___
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>>
>> To Unsubscribe or change delivery options go to:
>> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>>
>
>
> ___
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Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear or justfront?

[Barry Stark]

Andrew -
Some folks have posted in the past that by listening for the noise in a turn
you can load a wheel bearing and tell if it is on the right or left side.

Barry



> 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.



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Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear or justfront?

[andrew strasfogel]

It's only heard at speeds in excess of 45 mph, so that would be slightly
dangerous...



On Sat, Apr 25, 2009 at 3:48 AM, Barry Stark wrote:

> Andrew -
> Some folks have posted in the past that by listening for the noise in a
> turn
> you can load a wheel bearing and tell if it is on the right or left side.
>
> Barry
>
>
>
> > 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.
>
>
>
>  ___
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Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear or justfront?

[Curt Raymond]

No curvy highways? Theres one stretch near here that is just perfect for 
testing this ~45degrees at highway speed downhill. When I first got my 240D 
it'd growl like crazy on that stretch, once I got the wheel bearings repacked 
(something like 9 months later) it was quiet...

Peter mentioned replacing the races, I tried to do that with my 190D some 
months ago but couldn't get the old one out. At any rate the bearing fit good 
in the old one and showed no sign of having spun at any point.

-Curt

Date: Sat, 25 Apr 2009 09:53:53 -0400
From: andrew strasfogel 
Subject: Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear
    or    justfront?
To: Mercedes Discussion List 
Message-ID:
    
Content-Type: text/plain; charset="iso-8859-1"

It's only heard at speeds in excess of 45 mph, so that would be slightly
dangerous...



On Sat, Apr 25, 2009 at 3:48 AM, Barry Stark wrote:

> Andrew -
> Some folks have posted in the past that by listening for the noise in a
> turn
> you can load a wheel bearing and tell if it is on the right or left side.
>
> Barry
>


  
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Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear, or justfront?

[MG]

What you never go faster then 40 or so in curves? It must be a ton of 
fun to be caught behind you when you drive.


If the sound doesn't change with different road surface conditions it 
isn't tires. Have you checked the mounts for the airfilter.


Manfred



Date: Sat, 25 Apr 2009 09:53:53 -0400
From: andrew strasfogel 
Subject: Re: [MBZ] Noisy W123 bearings - how diagnose? Front AND rear
or    justfront?


It's only heard at speeds in excess of 45 mph, so that would be slightly
dangerous...

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