Peculiar noise

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My wife's Note has developed a peculiar noise, sort of a low hum when driving. It seems to be speed rather than engine related. I have jakced it up and had look underneath. Exhaust seems OK. All wheels turing freely not brakes sticking, no bearing noise ( I thought it might be  a wheel bearing) no significant play in dirve shafts. Drive belt looks ok. 

If pushed I would say it is coming from the back of the car but it is difficult to tell becasue the low frequency makes it hard to tell. 

Anyone any ideas? 

Edited by DavidUK1

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DavidUK1 Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 10 November 2010 Status: Offline Points: 24	Post Options Post Reply Quote DavidUK1 Report Post Thanks(0) Quote Reply Topic: Peculiar noise Posted: 01 July 2011 at 17:12
	My wife's Note has developed a peculiar noise, sort of a low hum when driving. It seems to be speed rather than engine related. I have jakced it up and had look underneath. Exhaust seems OK. All wheels turing freely not brakes sticking, no bearing noise ( I thought it might be a wheel bearing) no significant play in dirve shafts. Drive belt looks ok. If pushed I would say it is coming from the back of the car but it is difficult to tell becasue the low frequency makes it hard to tell. Anyone any ideas? Edited by DavidUK1

mdvineng Members Profile Send Private Message Find Members Posts Add to Buddy List Established Member Joined: 11 May 2011 Location: United Kingdom Status: Offline Points: 103	Post Options Post Reply Quote mdvineng Report Post Thanks(0) Quote Reply Posted: 01 July 2011 at 19:30
	check tyre pressures, as low pressure allows the tyres to deform more and that can create the noise. with low profile tyres a visible check is no good, you have to use a gauge, I've seen such tyres look OK but measure less than 15 psi.
	both motorcycle wheels drifting with the power on feels great

Guests Members Profile Send Private Message Find Members Posts Add to Buddy List Guest	Post Options Post Reply Quote Guests Thanks(0) Quote Reply Posted: 01 July 2011 at 22:02
	hum from from the rear poss wheel bearings, jack the car up and grab the wheel at the top and bottom and see if theres any play do the same at the sides if in doubt whip the drums off and inspect

DavidUK1 Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 10 November 2010 Status: Offline Points: 24	Post Options Post Reply Quote DavidUK1 Report Post Thanks(0) Quote Reply Posted: 02 July 2011 at 01:15
	Fair comment on the tyre pressures I will check those. Bearings already checked, I have trailers and am used to doing them.

mdvineng Members Profile Send Private Message Find Members Posts Add to Buddy List Established Member Joined: 11 May 2011 Location: United Kingdom Status: Offline Points: 103	Post Options Post Reply Quote mdvineng Report Post Thanks(0) Quote Reply Posted: 02 July 2011 at 11:11
	the other cause of tyre hum is a bulge in the side walls.
	both motorcycle wheels drifting with the power on feels great

DavidUK1 Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 10 November 2010 Status: Offline Points: 24	Post Options Post Reply Quote DavidUK1 Report Post Thanks(0) Quote Reply Posted: 04 July 2011 at 18:11
	Tyre pressure all within a 1lb or so of recommended pressure. I will have a look at the tyre walls.

mdvineng Members Profile Send Private Message Find Members Posts Add to Buddy List Established Member Joined: 11 May 2011 Location: United Kingdom Status: Offline Points: 103	Post Options Post Reply Quote mdvineng Report Post Thanks(0) Quote Reply Posted: 05 July 2011 at 14:20
	Also check to see if any balance weights have fallen off?
	both motorcycle wheels drifting with the power on feels great

DavidUK1 Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 10 November 2010 Status: Offline Points: 24	Post Options Post Reply Quote DavidUK1 Report Post Thanks(0) Quote Reply Posted: 05 July 2011 at 15:37
	I would expect dropped weights and bulges to exhibit a rythmic sound each time the wheel turned this is fairly constant low hum (like a wheelk bearing but they appear fine).

mdvineng Members Profile Send Private Message Find Members Posts Add to Buddy List Established Member Joined: 11 May 2011 Location: United Kingdom Status: Offline Points: 103	Post Options Post Reply Quote mdvineng Report Post Thanks(0) Quote Reply Posted: 05 July 2011 at 15:57
	That would seem true, so may be it is the wheel bearings. Do you know which side of the car it comes from, if so switch the wheels around and see if the symptoms follow suit.
	both motorcycle wheels drifting with the power on feels great

DavidUK1 Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 10 November 2010 Status: Offline Points: 24	Post Options Post Reply Quote DavidUK1 Report Post Thanks(0) Quote Reply Posted: 06 July 2011 at 18:40
	Local Garage has diagnosed rear wheel bearing. Maybe I didn't spin wheel fast enough to hear it because that was the first thing I looked at. There did not appear to be any play either. We will see if it has gone when I pick it up tomorrow. Edited by DavidUK1