Huming/knocking? noise

mike_msch · September 25, 2017

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 · September 25, 2017

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 · September 25, 2017

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

September 25, 2017

46 minutes ago, mike_msch said:

Apparently the tracking cant be altered.

That sounds odd Mike. Where were you told this?

JOE-DOT-COM · September 25, 2017

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 · September 28, 2017

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

mike_msch · September 30, 2017

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 · September 30, 2017

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

O.T.H · October 2, 2017

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 · October 12, 2017

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 · October 13, 2017

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 · October 13, 2017

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 · October 14, 2017

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.