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[Turk]

I have a faint grinding sound from about 10mph upwards and this develops into an annoying hum at around 70mph+.  
I suspect wheel bearings have dried out as they feel fine when checked. I'm just a bit loathed to spend money on new bearings to still have that darned sound.
I'm usually able to determine which side has gone by listening to the noise when driving thru a bend. If the left bearing is worn the noise usually diminishes when going thru a left hand bend as the weight transfers to the right hand side, but neither left or right bends show any change. Could both have worn equally ?
The grinding noise increases when decelerating, as the weight bias is to the front.
I've recently changed the wishbones, engine mountings and had a geometric set up.
I suspected the bearings may be worn when I bought the car and noticed the w/bone bushes were shot.
Just trying not to spend money fixing things that ain't broken.
Anybody have any suggestions(Apart from "Scrap it !!")  or have experienced these symptoms ?

[Big_Mart]

Right to comfirm you`ll need to take your car somewere quiet jack it up and spin the wheels put your ear as close as possible to the wheel and listen if you can hear any noise/werring etc its kerfunked and needs replacing i think you said youve checked for play etc if you haven`t do that to  

[Turk]

It's a strange one !
The play was checked by my mate. He owns an MOT Test Centre so he knows when they are remotely faulty. He says the bearings "feel" ok. A colleage says he used to have a problem with the bearings drying out and becoming noisy.

I'll try the "quiet corner" check.

[sassanach]

 i had a similar problem which drove me nuts. i ended up changing BOTH front wheel bearings only to find it was the tyres making the noise (cheapies)

[Marks DTM Calib]

They dont tend to dry up on the Omega as they are well sealed units.

When very worn they get play.....which you can feel.

They cost about 30 quid and are easy to change but.....do check the tyres first (you could try swapping front to back or using the spare on a hub at a time)

[Turk]

I did think along the lines of tyre noise, but I'm starting to look towards the transmission side of things now.
I've recently had the well kn@ckered DMF changed. The noise seems to have appeared since then. There's a fair bit of oil around the diff, and I'm think that maybe it's a combination of the diff oil needs replenishing(er..HOW TO...anyone ?) and worn propshaft bushes. With the DMF not so loose to compensate for these, maybe it's there I need to look...or am I talking complete Bow-locks ?
I have about 2" free play on the proftshaft when I last checked it manually. (Is this correct ?)  
On studying the noise it appears to be more of a throbbing or pulsating mid range whine/hum that changes to more of a whine when the clutch is depressed.
I'm gonna get my bro in law to sit in the back and see if he can pinpoint the noise.
Right time for a run !

[Turk]

Have you ever had the feeling that you should have stayed at home

Take 1 new by-pass...add 1 large traffic island...mix in a directional arrow bollard with faulty lighting and a generous measure of rain.  The perfect recipe for a miserable christmas eve !!
  
Front and rear drivers side tires blown and the full geometric set up, last friday, down the pan.
I'd managed to avoid hitting the island full on and just nipped the corner, the worst case scenario will hopefully just be a new wishbones (£45), Track rod gubbins (£35)  and two new tyres(£65 each), The alloys "look" ok...Oh, and another geometric (£60). Thank goodness I was in a 30mph zone.
 
I sat there thinking I was a total bell-end, and just wasn't paying attention, until a bloke comes running up to the car, offering to be a witness. Turns out he was waiting for the RAC to come and get him. He'd done exactly the same thing 10mins earlier. He had much bigger issues as he'd hit the island full on. Two trashed alloys and various warning lights on his dash lit up like a Christmas tree.

All this happened smack bang in front of local Police Station. Apparently crimbo revellers had knocked
the bollards over the night before and the council had been out to replace them, but hadn't sorted out the illumination issue.  We reported the incident and within an hour the council were there, covering the un-lit island with reflective bollards.

In the mean time, I have my sisters MG-F. Don't get me wrong, It's a great little car and I'm really greatfull for the use...but it's like a Go-kart. It feels like I'm driving with my knees around my ears.
...and I have a 500 mile trip over the new years period.

There's a claim heading the councils way pretty darned soon !!

Merry christmas folks.