Help! steering shaft vibration info

[Greg Schilhab <gschil@orthomed.org>]

I'm experiencing the joy of my new 16V-very solid and fast but I want it 
perfect. There is a problem with excessive vibration being transmitted 
from the engine to my hands on the wheel.

Symptoms. At idle a lot of steering wheel vibration. Disappears at 1200 
rpm. Jerking the wheel back and forth reveals a slight ticking- a bit of 
play which may be unrelated. Also occasionally if I go over a speed bump 
there's something which knocks and is also felt in the steering wheel.

Its not the motormounts-The front and right side were replaced and 
they're all in great shape-the dash itself is rock solid. The ball 
joints, tie rods and struts are all solid as well. 

Is there some mechanism which uncouples the steering shaft from the 
vibration of the engine? Looking at the exploded view in the Bentley, I 
see something called the Damping Grommet which is mounted on the 
universal joint shaft. Is this it?  Also the steering column bearing and 
the shaft bushing if worn would need to be replaced, no? These are just 
guesses, though, I need the experts here as the Bentley doesn't delve 
into it to deeply.

Thank-you in advance 

Greg  

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