Huming/knocking? noise

[mike_msch]

I found that the x type 2.5 sport is generally noisy on the roads. Exhaust is nice and quite. Now i have had the suspension and wheel bearings checked over, prop shaft has been checked, brakes tested at the mot station and they are all perfect. No play or warping of discs. I have put new tyres on the front (tyre fitter said that some awd x types wear the insides of the front tyres quicky). Now my issue is a humming/knocking noise at 30-50mph. It is hardly noticeable on rough roads or driving up hill. Smooth roads are the worst. I did recently fit new front pads but left the original discs on as they are looking good. Any suggestions apart from turn the radio up? 

[O.T.H]

Hi Michail --Are you sure all wheels are balanced OK as it sounds like a wheel because of the speed it happens?????

just a thought.

Frank

 

[mike_msch]

Thanks for your reply. All wheels are balanced. Apparently the tracking cant be altered.

[Guest]

46 minutes ago, mike_msch said:

Apparently the tracking cant be altered.

That sounds odd Mike. Where were you told this?

[JOE-DOT-COM]

Hi

There not winter tyres are they, some winter tyres can be quite noisy

due to the softer compound and tread pattern

cheers

Joe

 

[mike_msch]

Mid range tyres all round. Seemed hardly noticeable this morning. The roads where wet. Very confusing.

[mike_msch]

Car went through MOT with no advisories. I have been doing test runs on the same stretch of road for the last few days. It does get louder and quiter to non existence on certain parts of the road. I am still struggling to believe it is the tyres as the noise is similar to a worn wheel bearing. I guess process of elimination is next. Not keen on throwing money at the car. But what else can i do if a mechanic cant find anything.

[phil67]

I have heard that when a tyre is slightly out of shape it can produce a wheel bearing sort of noise.

[O.T.H]

Yes I also think its  a tyre problem when I fist had my car it was road noisy after someone said it could be the tyres 

I changed all four the difference was fantastic  you can now hear the clock tick [if you know what i mean] it now sounds like a Jaguar.

Frank]

[mike_msch]

Finally chased down the problem. Jacked the front up and found its driver side bearing. Even though there is no play in the wheel, i can feel some vibration through the spring. All the other wheels are perfect and spin smoothly. Need new rear tyres as they are out of shape (still legal).

[mike_msch]

Confirmed by mechanic. Quoted £224 to replace 1 bearing. Think that is a bit steep. Considering that a complete hub with bearing is £89 and is about 1 hours work. I need to shop around now

[johnw777]

7 hours ago, mike_msch said:

Confirmed by mechanic. Quoted £224 to replace 1 bearing. Think that is a bit steep. Considering that a complete hub with bearing is £89 and is about 1 hours work. I need to shop around now

Iv'e just bought one of those hubs for £89, much easier than trying to change the bearing as you need special tools.

[mike_msch]

One more quote to get. The hub does look easy to replace. Considering i have had those brakes off about hundred times, im sure a hub replacement wouldnt be time consuming. 

[Guest]

Had a similar problem on my x type. Tried everything and yes finally replaced front bearings and now quiet.

Cheers

Rod