Rolys mk10 wrote on 25.03.2012 at 17:05:25:

Roly,

If the whine is constant with road speed, probably not noticeable until the car reaches 30 mph or more and then remains constant up through the speed range, simply varying in volume, then if the wheel bearings are good, it is either the diff output bearings (the easy one) or the diff carrier bearing (nasty!).

If the sound starts as soon as the car moves off and the tone changes depending upon whether you are accelerating or on the over-run, then suspect the pinion shaft bearings (also nasty!)

If the carrier bearings or the pinion bearings are the problem, you need the diff out for overhaul / replacement with an exchange unit - and that means dropping and dismantling the entire rear suspension.

Not a Sunday afternoon job!

Best to drain the diff oil and check for metallic debris in the oil or on the magnetic drain plug. If you find any, it will not get any better and you either live with it or get it replaced.

You can check for excessive end-play in the diff output shaft bearings by sticking your fingers between the output flange and the diff housing while someone waggles the rear wheel top and bottom.

3 to 6 thou is normal. Above that, replace the output shafts on exchange with ones with new bearings and seals.

Rolys mk10 wrote on 25.03.2012 at 19:03:59:


Roly,

Yes, Daimlers of that year came with LSD as standard fit.

The original diff oil was Shell Spirax Super 90 but that has not been available for a few years.  I believe this stuff is the recommended alternative :-

http://www.opieoils.co.uk/p-69330-shell-thermally-stable-super-90-premium-qualit...

BTW, if you are doing it yourself, you need 2.1 litres in the diff, but DO make sure that you can remove the fill/level plug BEFORE you remove the drain plug 

Rolys mk10 wrote on 26.03.2012 at 18:30:00:


Roly,

Certainly sounds like it. If you can rock the wheel in the horizontal plane _and_ the vertical plane then it is certainly the wheel bearing.

If in the vertical plane _only_ then it is the output shaft bearings and/or the U/Js.

Well time for action by a garage(not fit enough myself).. picked picasso up tonight from work and noise is deffo becoming louder... if it is the rear wheel bearing then best sort it now.


dropped son in town and came home... he has just arrived home with a bruise on lip and a loose tooth..... been in a fight....i will bloody swing for him.. and kick his mum's ass.!

cars back.. chap says no whine now and changed plugs no problem





so why didnt the jag toolbox plug spanner fit then... seems it was a thin snap on socket.

Pockets wrote on 11.04.2012 at 20:11:08:

yep siad carrier was a little rusty but stub axle no wear.... so caught it by the sounds of it....

covkid wrote on 11.04.2012 at 20:38:19:

sounds like it covkid. i havnt driven the car yet.. wildo tomorrow