Hello Good People,


When first accelerating from a cold start I can easily hear a thumping sound in back of the drivers seat. The thumping sound eventually goes away but I am concerned as to what it is.


Take me school so I can keep this car on the road for another 40yrs.


Thanks

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85 300TD (169K)

What car?

1985 300D Turbo

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85 300TD (169K)

Most likely driveline center support torn.

As Hercules said, inspect center carrier bearing on driveshaft.

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Jim

Thanks guy for the quick response.
Is this something I can do in the driveway on jack stands?


I was hoping to stop cursing and swearing in 2025


Thanks

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85 300TD (169K)

Yes, you should be able to but the cussing and swearing will continue.

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Jim

It's a poltergeist; you have roused it from a sound sleep, so what did you expect?

+3 for center support bearing. Symptoms for that are exactly as you describe.

Not too hard of a job, just be sure to mark the driveshaft halves and maybe replace the flex discs while you're at it. I've found having a long prybar to gently compress the driveshaft is very helpful for getting it in and out of the car.

Make sure it is situated where it wont roll once you disconnect d/s.

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Jim

Thanks for the feedback Everyone!

The cussing and swearing probably is here to stay.

Seems to be plenty of poltergeist in these many German cars. Better a poltergeist than a Siren steering the ship toward jagged rocks, right?

The flex discs look really good, probably will replace while I'm in there.

Thank You!

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85 300TD (169K)