240D loud hum when turning left

This started recently. If I turn slowly there is no noise. If I go quickly it sounds like a hum made a rubber wheel on a thin plate. The wheel on the road need be turned only about 20 degrees
to generate the noise. I jacked up the car and there is no play at all in the wheel bearings. I crawled underneath and saw only one likely thing. There is an arm, that the spring rests on, from the wheel to the chassis and it has a bolt (about 5/8" diameter) passing through a hub on the end of the arm and then through two plates attached to the chassis. The ends of the section between the two plates each has a black rubber or plastic gasket or seal or similar and one of them is breaking up. This may have nothing to do with the problem but it was the only thing I could see that wasn't normal.
Wish this system would allow real sketches. Doing them via text is a real chore.
Help appreciated.
rf
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Have a shop check it; fixing this is not a bit of casual work with a wrench or two.
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checked your power steering fluid lately?
cheers, guenter

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wrote:

Thanks TGL and GS.
Curiously the last twice I have taken the car out, there was no hum. However, I'll take your advice GS and top up the PS reservoir. Will report back about how this goes.
Thanks again and enjoy the new week :-)
rf
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Hello again Guenter.
I have used the car numerous times since my last post and the noise appears only occasionally. I took the cap off the steering pump reservoir and it's very full, so I guess we have to think further???
Back to square one guys? What's the next suggestion? Possibly something in the steering linkage?
TIA
rf
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Can you get this hum to occur if the car is not moving (e.g. just turning the wheel while in park)? The reason I ask is that I had a rather unusual noise when turning left on my '95 E320 after rotating the tires and replacing the brake rotors/pads. It was almost like a grinding noise. At first I thought it was a bad pad, but on further inspection it turned out to be a very minor difference in the rim. There is very little clearance between the brake caliper and the rim and the difference was enough to sometimes cause the inside of the rim to rub the outside of the caliper (you could see on the rim where the two had rubbed together). After switching rims around the noise went away.
Josh
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Thanks Josh for the info.
The noise comes on only when I am turning and not at all when stationary. I have not made any adjustment to the brakes recently and a few months ago, when I looked, the brakes still had lots of "meat" on them. The tires were rotated about six months ago and this noise started only a few weeks ago.
Puzzling....
rf
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Thanks Josh for the info.
The noise comes on only when I am turning and not at all when stationary or just crawling along. I have not made any adjustment to the brakes recently and a few months ago, when I looked, the brakes still had lots of lining left. The tires were rotated about six months ago and this noise started only a few weeks ago.
Puzzling....
rf
wrote:

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