2011 XF tyre issue and wiring noise

[MPETT]

Hi,
Has anyone experiences tyre wear issues with their xf? My car had its MOT on Friday and my car the xf they had in in the morning had the same tyre wear issue. Near side front inside edge worn through to cords and the outside of the off side true worn. I asked jag and they said it was a common wear issue with the xf. I've also been having a wiring sound which increases with speed and doesn't change with cornering. I assumed thisi would be due to the worn front tyres, but having fitted new tyres on the front today, the issue persists. During the fitting, they balanced the rears, which obviously hadn't been done when new rears were fitted 6 weeks ago.

The balancing and new fronts hasn't fixed it, so I'm going to rotate the tyres front to back and if it still persists, maybe it's the rear bearings? Does anyone have any other ideas?

Thanks for any of your thoughts.

P.s. I've fitted nexen n8000 255/35/20 tyres all round. I don't know if this is relaxant but I had to replace the offside rear tie rod 4 weeks ago due to a worn ball joint.

[Simpo Two]

Sounds like you need to get the geometry properly checked. By 'wiring' do you mean 'whirring'?

[MPETT]

Hi, I forgot to mention that. I've had a 4 wheel alignment done, but that was after a few weeks of driving on the new rear tyres and before changing the ball joint (tie rod).

[Simpo Two]

I'm no expert but could the car have been in a prang and been subtlely knocked off-square? Has it always done it whilst you've owned it?

[aero250]

Mine always wears inner edges on both fronts but as getting 50 k to set of tyres it is not a problem
Not really a whirling noise but needed upper ball joints.(120k) Difficult to diagnose as in some positions you cannot see movement in the joint

[Jaguar steve]

MPETT said:

Hi, I forgot to mention that. I've had a 4 wheel alignment done, but that was after a few weeks of driving on the new rear tyres and before changing the ball joint (tie rod).

Alignment - providing there's enough adjustment can result in correct geometry figures showing on a seriously faulty car when it's stationary resting on the ramp. Things like slightly bent wishbones, soft bushes or missaligned steering racks can all be dialed out and not all technicians will ask themselves why they need to make adjustments in the first place or make further investigations, they just stare at the screen and twiddle spanners till they get the right numbers under the impression of the alignment kit says it's all good that's all they need to do.

If there's any excess component movement or slack in bushings or physical damage to the suspension that might only become apparent when the components are under load when driving. Soft or excessive movement in wishbone bushes that might visually appear fine but allow excessive camber changes dynamically when cornering under load are a classic for this and usually result in exactly the symptoms of excessive edge tyre wear you describe.