Technical Fiat Panda - Front Wheel Bearing

[JAMLAX]

My main question is: How many thousand miles should I drive with a 'rumbling' wheel bearing?

I suspect the front offside needs replacing soon, judging by the pronounced noise - its especially noisy whenever (ever so slightly) I ease the steering towards the left. The main clue was when I eased off the throttle, reducing speed from 70 mph to 50 mph approaching a roundabout...very obvious noise! My brother mechanic had previously mentioned he suspected a wheel bearing might be on the way out.

Am I right in thinking a completely worn out wheel bearing can overheat to the point where the wheel hub shears and the wheel hub collapses?

 

[jrkitching]

Am I right in thinking a completely worn out wheel bearing can overheat to the point where the wheel hub shears and the wheel hub collapses?

I know of at least one case where this actually happened, leading to significant damage to the car; the driver was fortunate in so far as no other vehicle was involved.

The insurer paid for the repair cost, including a new hub, but deducted the price of the wheel bearing!

I would personally not continue to drive a car with a knowingly defective wheel bearing. Wheel bearing condition is part of the MOT for a reason, and if you were aware of the fault, it could invalidate your insurance.

 

[Pugglt Auld Jock]

My main question is: How many thousand miles should I drive with a 'rumbling' wheel bearing?

I suspect the front offside needs replacing soon, judging by the pronounced noise - its especially noisy whenever (ever so slightly) I ease the steering towards the left. The main clue was when I eased off the throttle, reducing speed from 70 mph to 50 mph approaching a roundabout...very obvious noise! My brother mechanic had previously mentioned he suspected a wheel bearing might be on the way out.

Am I right in thinking a completely worn out wheel bearing can overheat to the point where the wheel hub shears and the wheel hub collapses?

There's no way to reliably predict this - too many variables. I've known rumbly bearings to go on for quite a while and then seen ones which were rumbly one day and completely failed the next. Needs to be done a.s.a.p. in my view. If you leave it too long the hub, flange, and other parts, which would normally be reusable, may be damaged beyond reuse. This can significantly increase the cost of repair. And then there's the safety angle which should be obvious if you think about it to say nothing of what an invalid insurance could cost you.

 

[jrkitching]

There's no way to reliably predict this - too many variables. I've known rumbly bearings to go on for quite a while and then seen ones which were rumbly one day and completely failed the next.

This, exactly.

I've seen wheel bearings with so much play that the wheel was practically hanging off that were completely silent; I've had others that sounded like a screech owl yet had no discernable play whatsoever.

Not something worth taking a chance with, IMO.

 

[JAMLAX]

My instinct is totally in line with all the above answers. Thanks for putting things in the safety perspective. I'm resolved now to replace this bearing pronto!

 

[koalar]

My instinct says it needs diagnosing properly

Worse at 50 than 70 isn't normally wheel bearing

Although extra wind and road noise might be effecting the results

 

[JAMLAX]

Actually, I didn't say it was worse at 50 mph than at 70 mph! What I was trying to convey was this: as soon as I lifted my foot off the throttle (thus allowing the car to lose its steady cruising speed of 70 mph) the resulting slight shift in forward weight resulted in an immediate and steady 'noise alteration' that I am guessing is the front offside wheel-bearing.
I have jacked the front of the car up and spun the wheel with one hand (and keeping hold of the front spring with the other hand) I can feel a slight vibration from the spring as the wheel spins.

 

[Pugglt Auld Jock]

Actually, I didn't say it was worse at 50 mph than at 70 mph! What I was trying to convey was this: as soon as I lifted my foot off the throttle (thus allowing the car to lose its steady cruising speed of 70 mph) the resulting slight shift in forward weight resulted in an immediate and steady 'noise alteration' that I am guessing is the front offside wheel-bearing.
I have jacked the front of the car up and spun the wheel with one hand (and keeping hold of the front spring with the other hand) I can feel a slight vibration from the spring as the wheel spins.

One of the best ways to decide which wheel it is is to find a safe place - deserted road, empty supermarket car park, etc and weave the car side to side as you drive along. As the wheel comes under load it's usually louder - So a front right wheel bearing will be more noisy when steering to the left because it's more heavily laden.

 

[JAMLAX]

Yes, I've done the slight left multiple times and I'm sufficiently convinced I need a wheelbearing ... so I've already booked my regular local garage to take a look and do what's required! Many thanks all!

 

[Pugglt Auld Jock]

Yes, I've done the slight left multiple times and I'm sufficiently convinced I need a wheelbearing ... so I've already booked my regular local garage to take a look and do what's required! Many thanks all!

good luck, do keep us posted as to outcome?

 

[koalar]

Braking have any effect on the noise

Done dozens of wheel bearing, they use to be a common failure point but not as common these days

There normally speed dependant
They normally change with cornering loads

I never had one change noise when coasting

I guess there always an exception