[MBZ] 78 240D Making Odd Noise

2007-08-06 Thread Glenn Brown
Have you tried rotating the tires and, if so, does the sound still seem to
emanate from the same location?  If not, you may have an
internal separation.  Good luck.

G. M. Brown
Brevard, NC
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Re: [MBZ] 78 240D Making Odd Noise

2007-08-05 Thread LarryT
Thanks - the noise is nothing like that - more like a loud hum some have 
ascribed to a wheel bearing -- 

Glad it doesn;t sound like driveshaft problems -

Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
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- Original Message - 
From: Peter Frederick [EMAIL PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Saturday, August 04, 2007 8:26 PM
Subject: Re: [MBZ] 78 240D Making Odd Noise


 Bad center u-joint  sounds like a bad muffler, but varies with road
 speed independent of engine speed.  Cure is driveshaft replacement,
 it's much cheaper to get a used shaft than replace the bearing ($650
 last time I heard for the repair).  Used shaft is about $100.

 Check for vibration at the carrier -- just aft of the center of the
 driver's seat on the tunnel.

 A bad carrier bearing makes a grinding noise.

 Peter


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[MBZ] 78 240D Making Odd Noise

2007-08-04 Thread LarryT

Howdy -
My 240D has a sound like something is running besides the engine - like 
a roar that is not dependant on the speed of the engine but *is* dependant 
on the speed of the car.  My car has a solid fan attachment (no viscous 
clutch) and I've replaced the motor mounts which cured a lot of strange 
noises.

The roar gets louder as I speed up and quieter as I slow down.  What do 
bad center bearings sound like?   I've had bad u-joints on other cars and 
know what they felt like - and this ain;t like that.  Any reason I should 
expect the noise to be the same?

I must be rambling - never had a problem like this before -

Any ideas?

TIA -

Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS!  youroil.net
Weber Carb Info http://members.rennlist.com/webercarbs
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Re: [MBZ] 78 240D Making Odd Noise

2007-08-04 Thread Peter Frederick
Bad center u-joint  sounds like a bad muffler, but varies with road 
speed independent of engine speed.  Cure is driveshaft replacement, 
it's much cheaper to get a used shaft than replace the bearing ($650 
last time I heard for the repair).  Used shaft is about $100.

Check for vibration at the carrier -- just aft of the center of the 
driver's seat on the tunnel.

A bad carrier bearing makes a grinding noise.

Peter


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Re: [MBZ] 78 240D Making Odd Noise

2007-08-04 Thread Kevin Kraly
It could be the differential mount or a wheel bearing too.  My '81 300CD had 
a hum/roar coming from the right front that couldn't be heard until reaching 
at least 40MPH.  Beyond that, the hum would become higher in frequency.

Kevin in Portland, OR
1983 300SD 267Kmi, Ursula 


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