I bought this car a couple of weeks ago and I'm in the process of checking
the electrical,vacuum and mechanical. While in idle I noticed the main pulley,vibration damper and balancing disk assembly really wobbling . I don't think is normal but I want to ask this forum if they have any experience with this problem and how to correct it.

Thanks.

Possible issue:
Balancer dowel pins gone.
Bad balancer.
Bad crank shaft.
Bad pulley.

This job is no fun.
Here is an old thread that will scare you and give hope.

I'm Baaack! Big troubles though!
http://www.peachparts.com/shopforum/diesel-discussion/44713-im-baaack-big-troubles-though-post258821.html#post258821

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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
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1985 300SD
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Thanks whunter, I will start working on it and report what I find.
Hope is the pulley !!