Re: [MBZ] Thrumming noise

[Fmiser]

> Fmiser wrote:

> > Jim Cathey wrote:
> 
> > > The sound quits when the brakes are moderately applied.
> > > The sound quits when making a moderate right turn.
> > 
> > My guess is wheel bearings.
> 
> Okay.  'tis the direction I am leaning.  But I'm also lazy, and
> is someone has already chased this goose.

Twas the wheel bearing.

The outer one was obviously bad. Big divot out of the race. But
the noise was from the inner one - and it looked fine.

Anyway. Problems solved!!!Well, that one anyway.  Still need
to do the hatch lift assist cylinders, ball joint, and figure
out why the transmission kickdown quit working.

--   Philip

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Re: [MBZ] Thrumming noise

[Fmiser]

> Jim Cathey wrote:

> > The sound quits when the brakes are moderately applied.
> > The sound quits when making a moderate right turn.
> 
> My guess is wheel bearings.

Okay.  'tis the direction I am leaning.  But I'm also lazy, and
is someone has already chased this goose.

--  Philip

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Re: [MBZ] Thrumming noise

[Fmiser]

> OK Don wrote:

> Perhaps the drive shaft center bearing?

I figured if it was the driveshaft, bearing or flex disks I
would hear the sound with the car in the air.   But I've never
had any of the above go bad before...

--   Philip

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Re: [MBZ] Thrumming noise

[Dimitri Seretakis]

Ah thrumming not thumping. Sorry I misread the word.

Sent from my iPhone

On Jul 15, 2009, at 8:33 PM, Dimitri Seretakis  wrote:


Check both driveshaft flex disks and also make sure that the axle shaft boots 
are not torn as a worn hemi-axle shaft can make a loud thumping noise that 
starts after about 20 min of driving.

Sent from my iPhone

On Jul 15, 2009, at 8:23 PM, OK Don  wrote:

Perhaps the drive shaft center bearing?

On Wed, Jul 15, 2009 at 3:55 PM, Fmiser  wrote:

Troubleshooting challenge!

The car:   1985 W123 300TD (wagon)

The problem: A noise that sounds a lot like a noisy,
  big-lugged tire. It is faster than a tire-speed
  noise, so it's not a stone in the tire, etc.

Details:  The noise showed up a 1500 miles ago - very faint.
I didn't worry about it.  About 200 miles ago it started
getting louder.

Neither my passengers nor I could hear the sound outside the
car. (running next to the car or hanging out the window).

The sound quits when the brakes are moderately
applied. (moderate meaning. "a bit brisker than I usually use
to approach a known stop sign, not not so agressive it
startles any of my passengers")

The sound quits when making a moderate right turn. Seems to be
g-load rather than steering angle related, but I'm not sure.

I put the car on blocks so the back wheels where off the
ground. I did not hear the sound.

I looked at the front right (starboard) outer wheel
bearing. It look okay, but I was in a hotel parking lot so I
didn't look super closely.

Any clever ideas where to dig next?

Because it didn't show up when the back wheel where off the
ground _and_ it is influenced by braking and turning, I'm
thinking it has to be at the wheels

Maybe?

--   Philip


--
OK Don
Pair of W124 300D 2.5 Turbos


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Re: [MBZ] Thrumming noise

[Jim Cathey]

The sound quits when the brakes are moderately applied.
The sound quits when making a moderate right turn.


My guess is wheel bearings.

-- Jim



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Re: [MBZ] Thrumming noise

[Dimitri Seretakis]

Check both driveshaft flex disks and also make sure that the axle shaft boots 
are not torn as a worn hemi-axle shaft can make a loud thumping noise that 
starts after about 20 min of driving.

Sent from my iPhone

On Jul 15, 2009, at 8:23 PM, OK Don  wrote:

Perhaps the drive shaft center bearing?

On Wed, Jul 15, 2009 at 3:55 PM, Fmiser  wrote:

Troubleshooting challenge!

The car:   1985 W123 300TD (wagon)

The problem: A noise that sounds a lot like a noisy,
   big-lugged tire. It is faster than a tire-speed
   noise, so it's not a stone in the tire, etc.

Details:  The noise showed up a 1500 miles ago - very faint.
I didn't worry about it.  About 200 miles ago it started
getting louder.

Neither my passengers nor I could hear the sound outside the
car. (running next to the car or hanging out the window).

The sound quits when the brakes are moderately
applied. (moderate meaning. "a bit brisker than I usually use
to approach a known stop sign, not not so agressive it
startles any of my passengers")

The sound quits when making a moderate right turn. Seems to be
g-load rather than steering angle related, but I'm not sure.

I put the car on blocks so the back wheels where off the
ground. I did not hear the sound.

I looked at the front right (starboard) outer wheel
bearing. It look okay, but I was in a hotel parking lot so I
didn't look super closely.

Any clever ideas where to dig next?

Because it didn't show up when the back wheel where off the
ground _and_ it is influenced by braking and turning, I'm
thinking it has to be at the wheels

Maybe?

--   Philip


--
OK Don
Pair of W124 300D 2.5 Turbos


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Re: [MBZ] Thrumming noise

[OK Don]

Perhaps the drive shaft center bearing?

On Wed, Jul 15, 2009 at 3:55 PM, Fmiser  wrote:

> Troubleshooting challenge!
>
> The car:   1985 W123 300TD (wagon)
>
> The problem: A noise that sounds a lot like a noisy,
> big-lugged tire. It is faster than a tire-speed
> noise, so it's not a stone in the tire, etc.
>
> Details:  The noise showed up a 1500 miles ago - very faint.
> I didn't worry about it.  About 200 miles ago it started
> getting louder.
>
> Neither my passengers nor I could hear the sound outside the
> car. (running next to the car or hanging out the window).
>
> The sound quits when the brakes are moderately
> applied. (moderate meaning. "a bit brisker than I usually use
> to approach a known stop sign, not not so agressive it
> startles any of my passengers")
>
> The sound quits when making a moderate right turn. Seems to be
> g-load rather than steering angle related, but I'm not sure.
>
> I put the car on blocks so the back wheels where off the
> ground. I did not hear the sound.
>
> I looked at the front right (starboard) outer wheel
> bearing. It look okay, but I was in a hotel parking lot so I
> didn't look super closely.
>
> Any clever ideas where to dig next?
>
> Because it didn't show up when the back wheel where off the
> ground _and_ it is influenced by braking and turning, I'm
> thinking it has to be at the wheels
>
> Maybe?
>
> --   Philip
>
>
> --
> OK Don
> Pair of W124 300D 2.5 Turbos
>
>
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[MBZ] Thrumming noise

[Fmiser]

Troubleshooting challenge!

The car:   1985 W123 300TD (wagon)

The problem: A noise that sounds a lot like a noisy,
 big-lugged tire. It is faster than a tire-speed
 noise, so it's not a stone in the tire, etc.

Details:  The noise showed up a 1500 miles ago - very faint.
I didn't worry about it.  About 200 miles ago it started
getting louder.  

Neither my passengers nor I could hear the sound outside the
car. (running next to the car or hanging out the window).

The sound quits when the brakes are moderately
applied. (moderate meaning. "a bit brisker than I usually use
to approach a known stop sign, not not so agressive it
startles any of my passengers")

The sound quits when making a moderate right turn. Seems to be
g-load rather than steering angle related, but I'm not sure.

I put the car on blocks so the back wheels where off the
ground. I did not hear the sound.

I looked at the front right (starboard) outer wheel
bearing. It look okay, but I was in a hotel parking lot so I
didn't look super closely.

Any clever ideas where to dig next?

Because it didn't show up when the back wheel where off the
ground _and_ it is influenced by braking and turning, I'm
thinking it has to be at the wheels

Maybe?

--   Philip

___
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/

To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com