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  #1  
Old 03-21-2007, 06:22 PM
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Low rpm vibration noise on acceleration

Oooh, this is killing me. I'm adverse to car noises, I think it makes cars feel cheap. I know a diesel is louder than gas cars, but there is a very low rpm vibration noise, very deep sound, I can hear it all the time now if I just put my foot on the gas pedal a tiny bit to accelerate ever so slightly, and hold it there while accelerating. I'm thinking it could be the motor mounts needing to be replaced, and/or I recently replaced the shifter bushing, maybe I didn't have it in all the way and that's causing some vibration noise, I don't know. Very annoying.

Jeff 1991 300d, 103k

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  #2  
Old 03-21-2007, 09:03 PM
Cervan's Avatar
Crazy mechanic.
 
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may be that good old throaty deisle engine sound. take off the air cleaner and take a trip around the block you will soon know if its your intake or not.
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  #3  
Old 03-21-2007, 11:18 PM
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Rollin' on 16s
 
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Take a look at your flex disks.
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  #4  
Old 03-22-2007, 07:41 AM
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Quote:
Originally Posted by jbach36 View Post
Oooh, this is killing me. I'm adverse to car noises, I think it makes cars feel cheap. I know a diesel is louder than gas cars, but there is a very low rpm vibration noise, very deep sound, I can hear it all the time now if I just put my foot on the gas pedal a tiny bit to accelerate ever so slightly, and hold it there while accelerating. I'm thinking it could be the motor mounts needing to be replaced, and/or I recently replaced the shifter bushing, maybe I didn't have it in all the way and that's causing some vibration noise, I don't know. Very annoying.

Jeff 1991 300d, 103k
Yes, I know exactly what you mean. Its the most irritating vibration imaginable, Like a Droning that appears to vibrate the whole car and only generally occurs at lowish revs while pulling away-As revs increase it dissappears....

The cause is the Prop-Shaft Centre-Bearing rubber-mounting. These can tear and soften over time, heat, and oil to the point where the bearing outer contacts the frame holding the thing to the chassis. Its not easy to spot while the mounting is attached to the chassis, but remove the bolts and it becomes very obvious when you try to twist the mount sideways slightly!

My old 300D (Now deceased) had this problem coming on in its last days, and on dismantling, the outer ring inside the mounting bracket had nearly completely parted company with the outer of the bearing....
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W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....
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  #5  
Old 03-22-2007, 09:50 AM
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Where's the prop shaft?

Quote:
Originally Posted by Alastair View Post
Yes, I know exactly what you mean. Its the most irritating vibration imaginable, Like a Droning that appears to vibrate the whole car and only generally occurs at lowish revs while pulling away-As revs increase it dissappears....

The cause is the Prop-Shaft Centre-Bearing rubber-mounting. These can tear and soften over time, heat, and oil to the point where the bearing outer contacts the frame holding the thing to the chassis. Its not easy to spot while the mounting is attached to the chassis, but remove the bolts and it becomes very obvious when you try to twist the mount sideways slightly!

My old 300D (Now deceased) had this problem coming on in its last days, and on dismantling, the outer ring inside the mounting bracket had nearly completely parted company with the outer of the bearing....
Where is this thing, and how hard to fix?

jeff 1991 300d
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  #6  
Old 03-22-2007, 10:40 AM
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mmmmmm Diesel...
 
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Prop shaft = propeller shaft = drive shaft
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91 W124 300D Turbo replaced, Pressure W/G actuator installed. 195K

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  #7  
Old 03-25-2007, 12:45 AM
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How hard to fix?

How much of a job to fix that problem?

jeff

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