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LSD identification


gwb72tii

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1 hour ago, gwb72tii said:

how hard would it be to rebuild myself, or am I better off thanking it to a competent shop?

If its an original S40 from a 2002 and its just the LSD clutches that need a refresh then its quite straightforward. There's no need to touch the pinion and the shims at the sides can just be carefully stored & put back later. Just open it up, pull the output shafts and bearing carriers and then juggle the crownwheel assembly out of the case. Procedure is covered in the BMW WSM.

You can buy the wear/service parts here: https://racingdiffs.com/collections/lsd-clutch-plate/products/bmw-168-mm-lsd-clutch-packs, they also sell a 'ramp saver' that can help restore tolerance in a well-worn diff (make sure the friction discs match your splines). Note the 02 LSD doesnt have bellville washers for preload, as found in all the later BMW LSDs, it relys on the clutch pack stack-up height and a few shims to define the preload (shims available at W&N). This preload defines the 'coasting' slip rate, under power the ramps force the clutches into action, as defined by the ramp angle.

'59 Morris Minor, '67 Triumph TR4A, '68 Silver Shadow, '72 2002tii, '73 Jaguar E-Type,

'73 2002tii w/Alpina mods , '74 2002turbo, '85 Alfa Spider, '03 Lotus Elise

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Sorry if my question wasn’t clear, I was wondering how to tell the lockup percentage.

To answer your question, I haven’t driven my tii a lot for a lot of reasons, not from lack of wanting to. I’m going to be buying a lift again for our new house and can again start getting my hands dirty. The tii’s driveline feels loose, like either the universal joints are worn, or the diff is sloppy. I’m competent mechanically to work on the tii, but I’ve never worked on a diff, let alone a LSD. I actually enjoy working on cars so if it’s a job that isn’t going to require all kinds of special tools I’d just as soon do it myself.

 

72 2002tii

1988 535is  “Maeve”

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1 hour ago, dlacey said:

If its an original S40 from a 2002 and its just the LSD clutches that need a refresh then its quite straightforward. There's no need to touch the pinion and the shims at the sides can just be carefully stored & put back later. Just open it up, pull the output shafts and bearing carriers and then juggle the crownwheel assembly out of the case. Procedure is covered in the BMW WSM.

You can buy the wear/service parts here: https://racingdiffs.com/collections/lsd-clutch-plate/products/bmw-168-mm-lsd-clutch-packs, they also sell a 'ramp saver' that can help restore tolerance in a well-worn diff (make sure the friction discs match your splines). Note the 02 LSD doesnt have bellville washers for preload, as found in all the later BMW LSDs, it relys on the clutch pack stack-up height and a few shims to define the preload (shims available at W&N). This preload defines the 'coasting' slip rate, under power the ramps force the clutches into action, as defined by the ramp angle.

Thanks! Now I just have to learn the terminology so I can understand what you’re telling me! Lol I have a lot to learn.

Edited by gwb72tii

72 2002tii

1988 535is  “Maeve”

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Here's a few pics of an original one...badly abused .. but you can see the "S" case stamping. S40 is also stamped on the LSD barrel inside...you might be able to read that if you just remove the rear cover. As others have said 40+ years of maintenance may have altered the setup of the LSD.

 

'59 Morris Minor, '67 Triumph TR4A, '68 Silver Shadow, '72 2002tii, '73 Jaguar E-Type,

'73 2002tii w/Alpina mods , '74 2002turbo, '85 Alfa Spider, '03 Lotus Elise

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