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[toller]

My omega has had a rattle around the front passenger side wheel for quite a while, I had presumed it was the drop links which I changed a while ago and although it improved things slightly the rattle was still there.  Since then I have also changed the front wishbones and the track rods as the ball joints were a little on the slack side.

When I first changed the track rods it seemed to fix the rattle but after 2 or so days of them being on I was going over some fairly large speed bumps and there was a rather large clunk from the front end and the rattle had come back.

I've had a look sevel times for anything thats loose, i've taken all the replaced parts off and put them back on, i've swung on everything and everything seems to be tight so i'm at a loss as to what else it could be.  About the only thing i've not looked at properly is the anti roll bar "D" bushes although when swinging on the anti roll bar it all feels fairly solid.

Any suggestions on what else to look for what be much appreciated.

[Bent valve]

Have you checked the base of the front spring? sometimes when they snap there they can rattle a bit..

[the alarming man]

could it be the exhaust but resonating through the bodywork? 

[Andy B]

....

Any suggestions on what else to look for what be much appreciated.

Does it go away if you're braking? My Senator used to do the same as this Omega, the sliding pins for the calipers wear.

[steve2.5cd]

Try checking the top of the front suspension legs ! 

[PhilRich]

Check the cat heat shields haven't come loose :-/

[Welung666]

Check the cat heat shields haven't come loose :-/

As an addendum to this, only do this when the car is stone cold! Touching the exhaust anywhere near the cats when the engine is hot will severely burn you so BE CAREFUL.