Hello All,
I have a 1985 300D Euro. When I accelerate from a dead stop the _______ (drive line???) makes a very heavy thumping vibration. It only does it when you accelerate from about 5-15 MPH and only from a dead (or really close to dead) stop. It seems to do this from all dead stop accelerations and is worse in the morning. In the morning if I get up to speed then remove the foot from the accelerator for a second it seems to stop it most times.
I've read through some of the posts and I'm hearing all sorts of things that could be wrong. I think the leading two are the Tranny Mount being bad or the Driveshaft center bushing/bearing.

Thank you for any imput,
Matt

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KI6CCA

Current Stable:
1987 300SDL
1980 450SEL

Out to Pasture:
1982 300D KIA (Rice Rocket vs. 123: He hit me at 80-100MPH I walked away he went to the hospital. Sounds fair to me!)
1985 300D EURO Scrapped (got more money from state than car was worth)
1979 & 1980 300SD Great Cars!

Go over to TECH, I read this morning about a 126 having I think the same issue. Turned out to be a BAD new flex disc, non OEM, that fell apart!

Flex disc or mount issue, Could maybe be center bearing in drive line but you would probably here it more consitantly at higher speeds to.

Sounds like an easy fix.

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Ryan
1985 300D Turbo Diesel
1984 200 Euro

Get under the car and check the following.

Center bearing rubber diaphram. This is #1 on the hit list in my opinion. It is a rubber membrane that supports the bearing and drive shaft. My SDL did this.

Flex discs. front a rear. If delaminating then replace. Or if shows variations from a solid hard disk plane.

Tranny and engine mounts. It's probably not them but your there so check them.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car