Roar / drone

[trev260764]

I have a 'roar' which seems to be coming from the rear - it was apparent before I had the brakes and pads done recently, and I thought it would disappear when the work was done. I still have the noise - a bit like wind in yer roof-bars, or a flat tyre. Not loud, but a low-level drone.

Any ideas? Wheel bearing?

 

[Diver944]

Sounds silly, but check the bottom of your spare wheel well. There should be a rubber bung in there, but often it's missing and the tiny hole lets in an awful lot of noise.

 

[trev260764]

I'll look tomorrow. Does sound silly though...

 

[Suffolk944]

ORIGINAL: Diver944

Sounds silly, but check the bottom of your spare wheel well. There should be a rubber bung in there, but often it's missing and the tiny hole lets in an awful lot of noise.

My bungs missing - is it part that is still available ?

 

[zcacogp]

Trev,

What is the noise related to? Engine speed or road speed? What about when coasting (out of gear and in gear) or under acceleration?

Such drones are often wheel bearing related, but will vary when cornering - getting worse when turning away from the affected side (so noisier when turning to the left implies a right-hand-side bearing.)

If it is mechanical (and Paul Smith's suggestion of the drain hole bung is an excellent one - sorry Jon, I don't know whether they are still available), then beware; noise can travel surprisingly far in a car, and may appear to be coming from somewhere other than the true origin.


Oli.

 

[pauljmcnulty]

I still have the noise - a bit like wind in yer roof-bars,

I once took my mechanic out for a test drive to source wheel-bearing drone on an Escort. He insisted I drive, and sat in the back to better diagnose the noise. He refused to charge me for curing the noise by removing the roof rack, but laughed about it for years. [&:]

 

[Mark_Bennett]

Sometimes part-worn tyres can generate unexpected drone noise.

 

[trev260764]

Bung is suitably in place. Are wheel bearings suspect?

 

[DavidL]

Yes wheel bearings are an option. I assumed my gearbox, new oil or not, was going to need work as I had a similar drone/whine.
Indie mentioned dodgy bearing noise which once both rears were done went away.
No as expensive as a gearbox rebuild but more than a rubber bung!

 

[trev260764]

Cheers David - are they a 'big' job on 944's? How much did you pay for the job. The wife wants to know...

 

[DavidL]

300 all in. You can tell her about 100!
I know it was quite hard work!

 

[trev260764]

I will have to check if there is any noise variance when in neutral. It does not appear to get any louder as speed increases. It's just there, and quire annoying! It could also be described as being similar to tyre noise on those concrete roads. Difficult to describe a noise really...

Tyres, by the way, are in good order.

 

[Fat Albert]

Eating the last 'Curiously strong Mint' in the tin can cure an annoying and elusive rattle....[][]

 

[Indi9xx]

rear 944 wheel bearings tend to fail in such a way that the noise becomes most noticable at around 40mph and will sound like a bassey droning noise... hard to describe in text but.. a bit like a "wohwohwohwohwoh" noise.. a deep humming noise.

We charge about £250 for changing a rear wheel bearing doing it properly NOT involving big hammers pounding the old bearing out and the new one in!! But having said that, your a serious distance away (having said that we have got customers comming as far as athens to use us!)

It is possible to do it yourself.. Just avoid any methods involving hammers! lol

 

[944 man]

Quality of work is inversely proportional to the size of hammer used.

 

[Hilux]

Pinion bearing?