What did you do with or to your Disco today

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Originally Posted by DAMINK

Im guessing it was the right front. Should always change both sides at the same time IMHO.

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LOL! your guess is probably as good as mine [biggrin]
But it's almost certainly LHS rear causing the noise(more noise through a RH bend, when more load on the LHS bearings).

I didn't mind doing the wrong bearing tho .. I'm sure that this one would have started failing at some point anyhow, the inner bearing race had blue spot markings. Outer race has some lateral wearing on the race too.
All surfaces smooth, but I'd reckon they'd have started to give up right at the most inopportune moment.

I'll get this LHR done, and then work on doing the RHS bearings sooner rather than later.

it's jobs like these on the D1 that has me dreaming of owning a D2! [thumbsupbig]

Did the rear left bearing today.

[thumbsupbig]
Still a PITA of a job, but 100% effective in eliminating the bearing noise.

Attachment 140623
Inner on the front.

Attachment 140624
Inner on the rear.

What caused that?

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Originally Posted by edddo

Whatcausedthat?

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The bearings have either had an electric current through them, OR more likely, the car has been sitting unused for some time in a place where there is small continuous vibration that has caused the spalling. Used to run up against this vibration cause on ships, where spare electric motor bearings would need to be changed before installing. It can also happen if vibration travels to a storage area that is near a road or even worse, a railway track.

TBH, I have no idea why they wore out in that way.
The rollers and cage that associated with those collars looked fine. All gummed up with grease(and chucked out), but didn't look overly worn or damaged.
Didn't see what brand they were either. Could have been cheapies .. possibly. I got Timkens tho.

I've had 'a bearing noise' for the past 6 months or so, which I think is the rear diff pinion bearing(just a guess, but feels/sounds like it).
I got two ATBs to fit front and rear in preparation to fix the diff, that is, if it did turn out to be the pinion bearing.
Mechanic is under the pump, and has yet to rebuild my diffs .. so I've had to live with this bearing sounding noise since.

The only anomaly with that noise tho, is that occasionally it does go away .. sort of. The noise sounds more like worn mud tyres.

But then a couple of weeks ago I noticed more noise which steadily got worse, and then the other day coming through a 80k/h right hander it got much louder!
Obvious thing was a LHS bearing .. being loaded up through the righthander.

Up till about 6 months ago, D1 hardly made any noises, very smooth other than typical 300 Tdi vibes/harshness/noise. Drivetrain has always been smooth and pretty quiet.
Car hardly sits still as it's my daily driver I estimate it's sat for a day maybe only 5 times in the past 2 years .. so definitely hasn't sat for the bearings to wear out in that manner.
Interesting part is both those wear marks are inner bearings on both LHS hubs.
Spindles are usable. Have the typical wear marks, but not worn badly for the bearings to sit uneven or loosely. They need a good push to slide the hub onto the spindle, so they feel like they seat tight.

Threw some 265/75 tyres on a spare set of 16x8 rims to replace the 31x10.5's iv been running on my 200tdi disco. It has a 1.4 hi ratio transfer and was hopelessly geared with the worn 31's (measuring under 30"). Seems much better after a quick drive, wait to see what its like on the open road.

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Originally Posted by Fausto79

have you got multimeter? tried to see if charging ok? maybe fault at tacho end or elsewhere in wiring. i would have thought if charging ok then not alternator issue but i'm not too sure about the alt internals so could be wrong. mine is jumping at the moment but it's charging properly. alternator is about 3 years old and its an expensive magneti marelli one.

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New alternator fitted. Tacho now working. Even though the old alt was charging, the tacho side was u/s.

Thank you Heather and Mario (Roverlord) for sending the new alt so quickly.

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Originally Posted by AK83

TBH, I have no idea why they wore out in that way.
The rollers and cage that associated with those collars looked fine. All gummed up with grease(and chucked out), but didn't look overly worn or damaged.
Didn't see what brand they were either. Could have been cheapies .. possibly. I got Timkens tho.

I've had 'a bearing noise' for the past 6 months or so, which I think is the rear diff pinion bearing(just a guess, but feels/sounds like it).
I got two ATBs to fit front and rear in preparation to fix the diff, that is, if it did turn out to be the pinion bearing.
Mechanic is under the pump, and has yet to rebuild my diffs .. so I've had to live with this bearing sounding noise since.

The only anomaly with that noise tho, is that occasionally it does go away .. sort of. The noise sounds more like worn mud tyres.

But then a couple of weeks ago I noticed more noise which steadily got worse, and then the other day coming through a 80k/h right hander it got much louder!
Obvious thing was a LHS bearing .. being loaded up through the righthander.

Up till about 6 months ago, D1 hardly made any noises, very smooth other than typical 300 Tdi vibes/harshness/noise. Drivetrain has always been smooth and pretty quiet.
Car hardly sits still as it's my daily driver I estimate it's sat for a day maybe only 5 times in the past 2 years .. so definitely hasn't sat for the bearings to wear out in that manner.
Interesting part is both those wear marks are inner bearings on both LHS hubs.
Spindles are usable. Have the typical wear marks, but not worn badly for the bearings to sit uneven or loosely. They need a good push to slide the hub onto the spindle, so they feel like they seat tight.

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I remember when i used to get a rumbling noise when turning right. Checked bearings n turned out that the seal let water in and all the grease got washed away n bearing seized and carved big grooves on stub axle. Basically had to redo front right assembly.

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Originally Posted by Fausto79

I remember when i used to get a rumbling noise when turning right. Checked bearings n turned out that the seal let water in and all the grease got washed away n bearing seized and carved big grooves on stub axle. Basically had to redo front right assembly.

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A good reason to convert to oil lubed wheel bearings - if seal becomes damaged at least you'll see the oil leaking out to let you know something is amiss before bearings/stubs are damaged.

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Originally Posted by Fausto79

I remember when i used to get a rumbling noise when turning right. Checked bearings n turned out that the seal let water in and all the grease got washed away n bearing seized and carved big grooves on stub axle. Basically had to redo front right assembly.

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ATM, I'm thinking it's the stub axle too.
Rear seal was fine, no grease leaking, and plenty of grease in there too .. in fact I think a bit too much in the cavity between the two bearings.
Strangely tho there were two grease colours in there, partly reddish and some black. Rear only had lots of black grease.

What's weird with my grinding noise is the way it comes and goes. At 80k/h it comes in loud, and doesn't change pitch or level now with turning, like it did the other week.
Does change level(or loudness) with undulations tho at 80-ish k/h. Quieter with rises.. so it sounds as though loading on it makes it louder/quieter.
But at 90-ish k/h it's basically gone, almost completely, but tyre noise may be masking some of the noise, but the difference between noise level at 80 and 90 is what has me .... :confused:
noise comes back at about 95+ ish.
And the noise can be moderated with throttle too. more pedal, less noise, back right off, and grrrrrrrrrr!(that is both me and the car! :D)

I have this one section of slightly downhill run coming off the freeway, brand spanking new asphalt. I can coast in neutral, and there is basically zero tyre noise on this new surface.
At 90(ooops! too fast :p) .. zero noise coasting, as it approaches 85k/h the noise starts growling .. and at 80k/h(with no risk to any demerit points too! [thumbsupbig]) .. it grumbles and growls madly.
Then gradually quietens again as I slow more .. by 70k/h gone again.
I did check the surface of the two stub axles, and they may be not OK, but felt OK to my basically untrained hands. Bearings seated nicely.

Only other thing I'm considering is a strangely worn CV, or maybe the needle bearing for the CV shaft(in the hub), due to the throttle on/off affecting the level of the noise.

Brother sat in the front too and he reckons it's coming from the left front too.
I just got under this morning and checked unis and all manner of brackets and mounts for looseness, and nothing looks out of the ordinary .. just a bit more play in the gearbox mounts than I remember on my RRC.