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[HockeyDave55]

I've had a look at the workshop manual and it shows a great exploded view showing all the assembly including the plates, I will try to get a look down one side to see the "X" then go from there, maybe a rebuild is coming my way?

[2woody]

apologies for the absence....

yes, Omega B limited-slip differentials can be refurbished, but at the current cost of parts, you'll be able to buy a replacement diff and the car to which it's attached for less money. Sorry, but rebuilding one is going to appeal to only the most hardcore of enthusiasts. The plate set is about £175, whilst the bearings are around £90 each and there's four of them.

The plate-type limited-slip diff works through a ramp and the plates. There's a ramp, up which the pivot shafts for the planet wheels move - and when they move, they impart an axial force to the clutches, hence the slip-reducing action. So, the locking factor depends on the angle of the slope and the "rate" of the clutches ( for that, read pre-load ). In the Omega B diff, the plate pre-tension can be changed by machining, but the slope angle cannot. You may get a small tightening through the plate tension.

I can build a diff to order, but please remember that there's my time on top of the parts prices.

[HockeyDave55]

Great explanation 2woody! Well... When I say great that is with exception to the costs you list!!! Holy cow!!! That is not cheep!
Ok, bottom line from you.... How do I check my LSD is working or indeed still fitted without taking shafts off?

[HockeyDave55]

2woody, are there alternative suppliers of parts? Who supplied the diff's to VX??
GKN makes all kinds of diff's and one looks exactly like the Omega unit, I might drop them a line...

[2woody]

Correction to your post - GKN made all kinds of diffs, the last being the Jaguar XJ40 unit, shortly before the diff-making facility was sold to Dana. Opel made their own I'm afraid. It could be ZF-related, but its certainly not a GKN product.

There is another possibility - but probably no cheaper. The Australian BTR diff ( now also owned by Dana ) is fitted into a casing that'll bolt directly into an Omega A rear subframe ( i.e. Carlton ). So if you can find a Carlton or Senator subframe and the corresponding BTR diff ( Lotus Carlton, Holden Commodore or Monaro, or TVR since 1994 ) and some Monza driveshafts ( as the diff has output flanges ), you can build yourself a very robust alternative. That's what I have in the Omega A race car.

The only reliable way to tell is by removing a driveshaft I'm afraid. Even so, it's not difficult.

Ignore what people will tell you about a wheel spinning backwards or vice-versa with the rear end suspended --- that's all bunkum.

you could do a mini-roundabout test - that's driving around the smallest mini roundabout you can find. The object is to spin up the inside rear wheel ( no LSD ) or get it sideways ( LSD ).

also, you'll find that if you set off from rest at full lock, slowly on a dry road, you'll hear the diff locking and unlocking, or rather you'll hear the tyres grabbing at the road surface - that's a good test if its still working

[HockeyDave55]

Thanks for the info (and the correction)  you've given me/us plenty to think about.
Right, I'm off to eBay (.au).....

[2woody]

just don't get Holden driveshafts - the subframe on a Holden, although looking identical to the Carlton one is actually a couple of inches wider.

When I had the subframe off one of the Holdens, I did a bit of experimentation.

[Zippy2012]

sorry to hijak post but how can you easy find out the diff ratios? as the seller is not prepaired to strip it down!!

ive found a 3.0 auto diff as a cheep replacement till i can get my lsd fixed but they dont know the ratio...??

i need a 3.45 out of im told a 2.2dti as atmo im running a 3.90 but its crap on the motorway on a manual box!!

is it just the 2.2dti that uses a 3.45??? & what poss ratio is the 3.0 auto diff??

cheers 

[Latchie_3.0v6]

car seems to go round no bother now. ive noticed that when i give her a good going, the abs light comes on and then i cant turn t/c back on again.
ive also noticed that the car will go round better when this happens. when i turn car off and on again everything is back to normal.
just wondering is there any way i could have the abs disabled all the time just so the car will go round better all the time.

[omegra]

casing that'll bolt directly into an Omega A rear subframe ( i.e. Carlton ). So if you can find a Carlton or Senator subframe and the corresponding BTR diff ( Lotus Carlton, Holden Commodore or Monaro, or TVR since 1994 ) and some Monza driveshafts ( as the diff has output flanges ), you can build yourself a very robust alternative. That's what I have in the Omega A race car.



i supose this has been tried but i take it that the monza diff wont take omega driveshafts if the output flanges are removed??