disco 1 diff whine, advise needed

[xlr8it]

Hi all,

I have a slight whine comming from the rear of my Disco 1, (checked it is not the wife or the kids), it does it only between 50 an 80 km/h and does not do it when you back off the accelerator. Only started doing after driving through the sand dunes at boat harbour. Could it be the diff or bearings? Whould changing the diff oil help? what else could it be?

It is V8 auto 95 model.

Any help would be great.

Thanks
Leon

[discowhite]

i had a whine that i could of sworn was the diff! i decided to check the
wheel bearings and they were rooted! this fixed my rear end whine.
now my transfer case whines! cant hear it on volume 10!!! 8)

phil.

[LRHybrid100]

maybe this noise is transfer bearings?

is it only when under load?

LRH

[xlr8it]

It does it at normal cruising but not when I back off the accelarator.

[CraigE]

My RR does the same but only when I back off the accelerator. Have checked everything but all appears OK. Rover drive trains do make some whining even from new, but if it changes or gets worse its time to investigate. As you have said that you were doing some sand driving the first items I would be checking are the rear wheel bearings, rear brakes and uni joints. If it is none of these it is a fairly simple job to pull the diff out and have a look and a feel. While you have it out it may be a good opportunity to change the wheel bearings any way. Also a good time to check the disc rotors as well. Thsi is what I did when I did mine and although the wheel bearings were still pretty good changed them out any way as they are not expensive and wrapped and sealed the old set as an emergency back up.

[one_iota]

I agree with CraigE's view. Start with the easy stuff. No harm done.

Logic suggests that the bearings are the first place to look and if you do it yourself how much more do you learn.

[101RRS]

My V8 disco 1 update has always whined on trailling throttle since new - wouldn't worry doo much unless whining is becoming a whinge.

[PhilipA]

Whining on power is usually the Pinion bearing. Check the seal on the front of the diff. If leaking then probably loose Pinion bearing. You may have become more sensitive recently as usually this builds up unnoticed for a long time, not after one event..
Whining on overrun usually diff carrier bearings.
To prevent damage to crown wheel and pinion it is best to bite the bullet and have the diff rebuilt with new bearings or it will always be noisy.
Wheel bearings usually waaa waaa noise, and changes around corners.

Regards Philip A

[xlr8it]

It does sound a bit like a waa waa sound but does not change around corners and it is not there when you are off the accelarator.

[PhilipA]

Likely to be Pinion , but impossible to say for sure from a distance.
If you get more sure of the Diagnosis,I know a good diff guy in Hornsby . He used to redo a diff for $350 years ago, by far the cheapest anywhere.
Lang Shields 0414 251443.
Regards Philip A