On my focus st170 I have a annoying humming coming from the rear. now I think its the bearing but when i jacked the rear up i could not feel any play in the wheels. it gets worse when in a straight line.and gets louder going fast. if i were on a right hand bend or turn to the right the noise dissappears! which to me makes me think the rear left bearing is on its way out?? any ideas?

 

Sounds like a bearing, that's about the only thing it could be, bar a sticking caliper but you'd no doubt have a roasting hot wheel if that were the case.

 

need to teach it some lyrics mate, so it doesnt need to hum

 

Jack it up and spin the wheel...hold the shaft of the shocker whilst its spinning...see if u can feel the roughness of the bearing transfering through the shocker.

 

I did spin it and must say it didnt sound great but it had no play or anything in it. dont think its much to replace anyway so will get a new one or swap the hub from the st170 i am breaking

 

how strange i was about to start a new thread about the same issue I'm having with my st170 only slightly different, i have no humming sound when driving in a straight line at all only when turning in left i get a humming sound from the rear? but it doesn't happen all the time, only on left turns that have a slight gradiant and even then its not every time, i have got 2 sound clips of the sound, the first one you can barely hear the sound at 5 seconds in, and the second one, the faint sound can be heard at 3 seconds in

http://www.mediafire.com/?v3h7v7pilghxvev

http://www.mediafire.com/?56t8om4yx48n8x1

does this sound like a wheel bearing? the sound is driving me bad because i cant pinpoint where its coming from? there is no play in my wheels whats so ever?

cheers for any help guys

 

The rear bearings are a common problem on a focus, they are pressed in so you will need a press to change them, otherwise you can buy new hubs with bearings already pressed in.

 

Bump. Anyone?

 

Check the rear tyres dont have any flat spots on them (usually on the iside edges), focus's commonly wear rear tyres like 50 pence pieces which gives wheel bearing failure like symptoms.

 

have checked tyres they are ok, they are only a couple of months old. i tightened up the bearing and noise is not as bad. i have taken the hub off my other st i am breaking and will swap it.

 

i swapped the bearing over from my other focus and still got the humming noise. i have heard that the parada spec 2 make a lot of road noise? am gonna swap my st170 rims onto the back to confirm it

 

If the noise increases with speed or increases when you turn one way or the other then it's almost certainly the wheel bearing.

If it gets louder when you're turning right then it's the left one and vice versa.

They only cost about Ł35 each from a good parts place and about the same or less to fit...no biggy.

 

i got the feeling its down to the tyres now, am going to put on my old st170 wheels and see what happens, i have spec 2s on now and have heard they make a lot of road noise

 

Its worth a check mate - knackered or cheap tyres can make a horrific difference.

 

yeh will try later when i finish work. the tyres on my st rims are only cheap ones and they never made a noise so hopefully when i swap rims over it will stop humming but i will have to put the st200 wheels back on as i dont want a mis match looking car but at least i know its the tyres then and could look at some different tyres