Rear Differential Rebuild/With Pictures

[z122643]

So…. here I go again. This time it's a full rebuild. New bearings, races, and seals. God help.

[The Dark Side of Will]

drawing a blank on the top Japanese name...

NSK

Bearings are standardized in size according to ANSI, DIN or JIC standards, so different MFG's bearings should be dimensionally interchangeable.

[Wanganstyle]

Skf bearings are sometimes germany sometimes japan sometimes brazil in origin.

F.a.g. is usually germany

Timken is usa.

BMW OEM use is SKF or FAG.

Bmw Never uses Timken OEM; I'm not 100% why the multi sourcing.

[The Dark Side of Will]

What Wanganstyle was saying was that a given MFG's bearings will be the same from any distributor...

SKF is probably the top Euro manufacturer; Timken the top US; drawing a blank on the top Japanese name...

[z122643]

Fixed.

Thank You

[The Dark Side of Will]

So which manufacturer has the best quality, and best prices?

Fixed.

[z122643]

So which supplier has the best quality, and best prices?

[Wanganstyle]

So where do you get your bearings from? I noticed your from the bay. I'm in the East Bay. (Sunol)

Cheers

Anywhere one desires?

More than one place to order a standard item from.

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[z122643]

Better way is to drop it off at a rear end shop close to you that has actually built a bmw differential before;

stabbing in the dark and not knowing from experience what to do is really bad when it comes to engines/differentials.

So where do you get your bearings from? I noticed your from the bay. I'm in the East Bay. (Sunol)

Cheers

[Wanganstyle]

I was going to get the bearings from BMW. I assume there is a better way?

Better way is to drop it off at a rear end shop close to you that has actually built a bmw differential before;

stabbing in the dark and not knowing from experience what to do is really bad when it comes to engines/differentials.

[z122643]

I was going to get the bearings from BMW. I assume there is a better way?

[The Dark Side of Will]

I dont see any pump inside; the top cap has a sealed viscous unit inside that does not come apart with normal means; I've sent 20 tons of press through a scrap one and it does not budge.

That's the pump... if the hub turns relative to the case, the piston should move out to squeeze the clutch packs. The viscosity of the silicone fluid means that it should take a bit of time for the fluid to flow back to the reservoir and thus take time for the assembly to compress again.

[Wanganstyle]

Where do you find the side cover bearing races? I am rebuilding the diff that came out of the car. It needs EVERYTHING!

Buy them from the same place the bearings are coming from; the part number for the race can be brought to any timken bearing dealer.

Remove all old bearings/races and take to bearing supplier.




In regards to the bmw gkn m.variable diff;

I dont see any pump inside; the top cap has a sealed viscous unit inside that does not come apart with normal means; I've sent 20 tons of press through a scrap one and it does not budge.

The left stub axel of all e46 m3s
'S engage 6 clutch discs and 7 steels; the stub runs through The viscous top cap.

On the left also are traditional clutch disc friction type just like a e30 standard clutch disc. The axle is stubby short and engages the spider cluster only.

[z122643]

Where do you find the side cover bearing races? I am rebuilding the diff that came out of the car. It needs EVERYTHING!

[The Dark Side of Will]

Nowhere did I say anything actually touches. Tangent.

Chicken egg equation

Realistically the plates inside vlsd will expand with heat.

This is a math bee beteeen tmi school kids

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Actually, I'm not sure what you said

OBTW, do you know if the 210mm 2.65 ratio gearset fits the same carrier as the 2.93 gearset?

Have you ever broken down and examined how a gkn visco lok functions? I have;

Its a viscous unit on the top cap that sends force to activste the left side clutch stack and activates the right side with the spider gears transferring the force (no ramps). Weird item

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The viscous unit is just a pump that applies axial load to a pretty normal clutch pack, similar to what's in the standard LSD's. It's not a viscous coupling.
As I mentioned, it's similar in principle to something that GM built, but it's just really weird that they went with the viscous pump rather than a gerotor.