Does that match the photos above? To me, they look more like damage from metal particles in the photos that appear in the articles shown in the links. Maybe a combination of the two? Maybe just general wear and tear (150,000 is a reasonable innings, I guess?) so that the case hardening is thinned to almost nothing, and then the metal particles in the oil have pierced what's left of it in various places?
Does that match the photos above? To me, they look more like damage from metal particles in the photos that appear in the articles shown in the links. Maybe a combination of the two? Maybe just general wear and tear (150,000 is a reasonable innings, I guess?) so that the case hardening is thinned to almost nothing, and then the metal particles in the oil have pierced what's left of it in various places?
Nodge68
Well-Known Member
A combination of mileage, overload and particles in the lubricant is the most likely cause.
The early Discovery 3 suffered a similar issue with the front diff. The bearing which de-lamintes is the one which carries both the diff loadings and the drive shaft support loads. The bearing on the other side of the diff only carries diff loadings, so suffers no real damage, even with particles of metal in the oil.
Near side D3 diff bearing, which supports the diff and drive shaft. This is quite obviously overloaded.
Off side, which only supports the diff, as the drive shaft has its own bearing at the other end of the diff casing.
GrumpyGel
Well-Known Member
That'd be similar to the diff bearings in a Freelander's IRD.
Nodge68
Well-Known Member
Yes the bearing are pretty similar in size and specification, and equally easily overloaded.
The only real difference it the IRD was made by, or at least designed by Steyr, but the D3 diffs are made by Dana.
Fitted my blanking plate today with new oil in, the drain had a bit of sludge in it and oil seem to be fairly clear just black to say ive changed it only a few months ago. But still have a whining noise the under the car. Any help
Nodge68
Well-Known Member
Is it definitely from the IRD and not the gearbox?
The IRD can make a quiet whining sound (mine does on over-run), but it should be loud.
Not to sure could even be a bearing yet but can't hear anything when I spin the wheels.
I'll give that a try as soon as I get chance I just want to sort it so I can put prop back on with no noisesIt's definitely worth changing the gearbox oil too, which will improve shift quality, and might cure the noise too.
