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[Shackeng]

2.5TD Auto Estate, 118k, owned and maintained for 15 years. At 76mph or so I now get a nuisance low pitched boom/whine, apparently from the rear of the vehicle, possibly driver's side. Same in 3rd or 4th gear, applying handbrake seems to have no effect on noise. Any suggestions.

[tunnie]

Brave putting handbrake on at 76mph 

Could be a wheel bearing, no noise at lower speeds, high speed only? 

[Shackeng]

Handbrake on often helps to identify if it is a wheel bearing as the noise can change.
The noise is only really apparent at about 76 and above, although there is also a suggestion of it as it passes through 50.

[mickyboy123]

try this, get to about 30 or 40 mph then take your foot of the gas, if the noise pauses for a split second and then start agen it will be your bearings in the back axle , i have had this in a vauxhall carlton and its a horible noise like a high piched whine.

[Shackeng]

try this, get to about 30 or 40 mph then take your foot of the gas, if the noise pauses for a split second and then start agen it will be your bearings in the back axle , i have had this in a vauxhall carlton and its a horible noise like a high piched whine.

Thanks for the suggestion, but unfortunately there is no discernible noise at 30-40! (See OP)

[Kevin Wood]

Might be worth checking for an exhaust blow at the rear. Mine sounded just like a rumbling bearing when it leaked in front of the back box.

Also, check both rear tyres for anything untoward - strange wear pattern or any bulges, for example. failing that, it could be a wheel bearing, lobro joint or the diff, but very unlikely at that mileage, I'd say - unless a driveshaft gaitor has perished and let the joint deteriorate.

[Marks DTM Calib]

Swap the tyres over and see if the nosie moves.

[Shackeng]

Thanks guys, I'll check these out, exhaust sounds promising as tyres are almost new Enduros.

[slowboy]

my rear drivers side wheel bearing started like that. it got worse over two years so got sereck to change it .ok now.