LSD rebuild help

[adz79]

So upon taking my diff apart today all was going well until this...







The other pressure plate was fine, what could have caused this? can I clean it up on a surface grinder? Not sure how good the finish has to be, looks lapped but that could be caused by the rubbing over the years?!?

[makman]

looks like its got realy hot to me mate...what was the condition of the oil and level like?

[adz79]

Oil was good, it hadnt done that many miles since i changed it but it did get a tiny bit of abuse. It locked up well and was reasonably quiet.

[DanThe]

http://www.ebay.co.uk/itm/BMW-LSD-CLUTC ... 500wt_1361

[adz79]

http://www.ebay.co.uk/itm/BMW-LSD-CLUTC ... 500wt_1361

Cheers dude, got my eye on that already.

[gareth]

PM'd

Entirely saveable, i see loads like this. All too common with E30 LSD's now.

Surface grind, polish, new plates and as a result of the debris in the oil, all new bearings probably.

The bearings are when it gets tricky so unless you're a competent engineer it's best left to someone who knows how to carry this work out... like me

[rich318i]

PM'd

Entirely saveable, i see loads like this. All too common with E30 LSD's now.

Surface grind, polish, new plates and as a result of the debris in the oil, all new bearings probably.

The bearings are when it gets tricky so unless you're a competent engineer it's best left to someone who knows how to carry this work out... like me

what sort of figure is a full re-build from your self? just for furture ref

[adz79]

PM'd

Entirely saveable, i see loads like this. All too common with E30 LSD's now.

Surface grind, polish, new plates and as a result of the debris in the oil, all new bearings probably.

The bearings are when it gets tricky so unless you're a competent engineer it's best left to someone who knows how to carry this work out... like me

Cheers Gareth, pm recieved, read and hopefully understood!!

Time to buy some shiney bits and get the hammer out!!!!

[gareth]

PM'd

Entirely saveable, i see loads like this. All too common with E30 LSD's now.

Surface grind, polish, new plates and as a result of the debris in the oil, all new bearings probably.

The bearings are when it gets tricky so unless you're a competent engineer it's best left to someone who knows how to carry this work out... like me

what sort of figure is a full re-build from your self? just for furture ref

PM on it's way

[rich318i]

got it ta mate, silly question but whats the diffrence to a 25% to a 40% lock up? i know 100% lock is a welded diff

[gareth]

a higher lockup % means the amount of slip under load is reduced. an open diff is 0%, solid (welded) diff is 100%. Generally more lock makes the car more controllable on the limit but if you go too far it will be very lively in the wet as the wheels still need to rotate at different speeds to maintain traction

[rich318i]

got ya now , thats my mate 2-way diff makes it feels like it jumps round corners i.e the ferrari FXX on topgear

[gareth]

If it has too much lock then yes