loud noise

[hassan]

hi everyone, i have jazz 2003 1.4 petrol auto. it makes loud noise when driving but quiet when idle. noise starts above 20 mph and gets really loud  between 40-65 mph and no noise between 70-85 mph. i had a leaking exhaust and changed it . i noticed that the rev does no go over 5000 rbp(tested when idle). oil+oil filter+plugs all changed recently. any help will be appreciated

[Jocko]

Welcome. How loud are we talking here? I take it your catalytic converter has not been stolen? Have you checked under the car since the noise started?
Regards the rev limit. There is a rev limiter fitted to the Jazz, and in neutral, it will limit your revs to about 5K.

[hassan]

The catalytic converter is there but the noise is not from exhaust  because when i rev on stationary its just normal but its when driving its like  loud engine noise but not from engine i just dont know a word to describe it

[Jocko]

In that case, it could be the gearbox input bearing which is a common fault on the Mk 1 Jazz. It gets noisier as time goes on, but it won't fail and leave you stuck. I took my car to a local transmission specialist, and he replaced it for £324, all in. When it is noisy, does it go quiet when you push the clutch in?

[hassan]

hello again. the car is automatic no clutch. the noise is coming - i think- from the back

[Johncb500]

Has the noise started since you  had the exhaust done?

It might be vibrating against the body.

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[Jocko]

When I had the middlebox replaced, it started rattling up against the inner sill (driver's side). Just needed re-adjusted.

[hassan]

i took it the mechanic he said it is rear wheel bearings both sides and he want to  charge me £220 for new and £170 for used ones. so i decided to do it myself and watched some videos and it seems to be easy. the bearings cost around £17-35 and i have most of the tools . but somethings i don't understand
 1)they are selling the bearings with abs and without bearings which one to choose?.
2)is it drum brake or disc brake. its 53 plate
3)read something about not over tightening how is that done?
thanks

[sparky Paul]

1)they are selling the bearings with abs and without bearings which one to choose?.
2)is it drum brake or disc brake. its 53 plate
3)read something about not over tightening how is that done?

There are 3 types of rear bearing, and it's essential that you get the right ones.

Does your car have ABS? If it does, there will be an ABS warning light that will illuminate when you first switch on the ignition, and there will be an aluminium block with brake pipes coming out of it behind the driver's side headlamp.

Does your car have drum brakes or disc? Either can be fitted on a 53 plate. If they are discs, looking through the wheels, the rear brakes will look similar to the front.

Ideally, you should tighten the hub nut with a torque wrench set to the correct torque.

[Westy36]

"£170 for used ones" - That's a weird one. I've never heard of a garage fitting used wheel bearings!

[culzean]

i took it the mechanic he said it is rear wheel bearings both sides and he want to  charge me £220 for new and £170 for used ones. so i decided to do it myself and watched some videos and it seems to be easy. the bearings cost around £17-35 and i have most of the tools . but somethings i don't understand
 1)they are selling the bearings with abs and without bearings which one to choose?.
2)is it drum brake or disc brake. its 53 plate
3)read something about not over tightening how is that done?
thanks

If you do not know the difference between a drum and a disc brake I would let the mechanic do the job - just sayin'....

[embee]

Seems rather unusual (not impossible, but ....) for both rear wheel bearings to fail more or less at the same time. I don't recall wheel bearings being a weak point on a Jazz.

A friend once had a similar type of noise issue which he was told was wheel bearing (Mondeo). I took the rear wheel off to check before getting a new hub unit and found the tyre had become "corrugated", with a washboard type wear pattern round perhaps half the circumference. Bearing was fine.

I'd double check with the wheels off before buying parts. You should be able to feel any roughness or see any grease leaking out.

[sparky Paul]

Seems rather unusual (not impossible, but ....) for both rear wheel bearings to fail more or less at the same time. I don't recall wheel bearings being a weak point on a Jazz.

Rear ones certainly are, many threads on here. The saving grace is that replacements are cheap.

They also feel and sound absolutely fine when you spin them off the ground. If you can't identify which one it is by throwing weight on each side in corners, and it's not always easy, a mechanic's stethoscope on the stub axle, or the trusty old screwdriver to the ear, works. If you split the old bearings apart, there is pitting on the races which causes the noise.

'Scalloping' of the tyres that you describe is also a thing, and can certainly sound like a duff wheel bearing. Can be caused by faulty shock absorbers.