LSD, whats in there?

[NITROX]

hi all,
After having suspicians that the LSD was 'locked' in all the time, i did jack up test and sure enough its locked in.
i changed oil when got it with proper LSD stuff so dont think that was what caused it. i suspect its been like it all along as have felt tyres skipping the odd time when on gravel drive etc
so question is,
whats in there?
Friction plates? locking ring?
Am i looking at full axle strip down to remove diff to sort it?
or is there access through rear diff plate?

or does someone know magic way to free it?


cheers
steve

 

[96terrano]

That happend with me When turning on gravel. But then it stopped. When the LSD, gearbox and transfer case oil was changed.

 

[lacroupade]

hi all,
After having suspicians that the LSD was 'locked' in all the time, i did jack up test and sure enough its locked in.
i changed oil when got it with proper LSD stuff so dont think that was what caused it. i suspect its been like it all along as have felt tyres skipping the odd time when on gravel drive etc
so question is,
whats in there?
Friction plates? locking ring?
Am i looking at full axle strip down to remove diff to sort it?
or is there access through rear diff plate?

or does someone know magic way to free it?


cheers
steve

Theres probably a diagram in the manual somewhere but basically its a collection of gears and clutches (hence the need for 'less slippery' LSD oil - ordinary oil is too slippery and the clutches need to be able to exert a degree of friction, which LSD oil allows.

If it was jammed on you'd effectively have a fixed rear axle and you'd have tyre scrubbing every time you went round a bend.

Theres a lot of torque in these motors so a bit of skidding on gravel, or even tarmac, when you give it some wellie, is perfectly normal.

Remember when you're testing it that with both wheels jacked, it will behave exactly like a normal open diff. It only starts to operate if one wheel loses grip and starts to spin faster than the other, then the clutch packs kick in.

 

[NITROX]

Theres probably a diagram in the manual somewhere but basically its a collection of gears and clutches (hence the need for 'less slippery' LSD oil - ordinary oil is too slippery and the clutches need to be able to exert a degree of friction, which LSD oil allows.

If it was jammed on you'd effectively have a fixed rear axle and you'd have tyre scrubbing every time you went round a bend.

Theres a lot of torque in these motors so a bit of skidding on gravel, or even tarmac, when you give it some wellie, is perfectly normal.

Remember when you're testing it that with both wheels jacked, it will behave exactly like a normal open diff. It only starts to operate if one wheel loses grip and starts to spin faster than the other, then the clutch packs kick in.

hi,
thats what its doing, its acting like fixed axle, had both wheels off ground and both turn same way when you spin one.
been reading a bit on here so will try another oil flush, i did all oils when bought it in december, but will try another.

if that dont cure it i think itll be a strip down to free which bit still locked up.
im away again at moment so will check manual when home

cheers
steve

 

[geoffdown]

hi,
thats what its doing, its acting like fixed axle, had both wheels off ground and both turn same way when you spin one.
been reading a bit on here so will try another oil flush, i did all oils when bought it in december, but will try another.

if that dont cure it i think itll be a strip down to free which bit still locked up.
im away again at moment so will check manual when home

cheers
steve

thats how a lsd works if both wheels are off the ground they will turn the say way unlike and open diff like in every 2wd car on the road which will turn the other wheel in the oppsite direction. if you have 1 wheel on the ground the wheel in the air will be very hard to rotate this is normal so dont do another oil change all seams ok hope that helps

 

[NITROX]

thats how a lsd works if both wheels are off the ground they will turn the say way unlike and open diff like in every 2wd car on the road which will turn the other wheel in the oppsite direction. if you have 1 wheel on the ground the wheel in the air will be very hard to rotate this is normal so dont do another oil change all seams ok hope that helps

AH right,
thought it would only work when 'driven' through prop.
will try one wheel on ground and see what happens......
it may be working ok after all, i really must have more faith in it

steve

 

[lacroupade]

thats how a lsd works if both wheels are off the ground they will turn the say way unlike and open diff like in every 2wd car on the road which will turn the other wheel in the oppsite direction. if you have 1 wheel on the ground the wheel in the air will be very hard to rotate this is normal so dont do another oil change all seams ok hope that helps

#

Weird cos thats the opposite of what you'd expect because surely the clutch packs aren't engaged in that state.....but I defer to your experience never having tried it

 

[geoffdown]

#

Weird cos thats the opposite of what you'd expect because surely the clutch packs aren't engaged in that state.....but I defer to your experience never having tried it

i think they r engaged at that state and slip at a givven point to allow the car to go round a cornner but i have been known to be wrong:augie

 

[lacroupade]

i think they r engaged at that state and slip at a givven point to allow the car to go round a cornner but i have been known to be wrong:augie

me too, my wife reminds me of it constantly LOL

....I can't get my head around the logic of it, probably still pissed from Saturday night, but AFAIK the clutch packs start to lock as one wheel loses grip to effectively make the axle go rigid and keep drive going to both sides.....but I can't work out how that works with no drive at all or with external input like turning the wheel by hand.

Oh well - but at least we agree that it doesn't sound like he has a problem from what he says!:thumbs

 

[lacroupade]

Top man, you were right! :thumb2:thumb2

<iframe width="425" height="349" src="http://www.youtube.com/embed/Am9Jvj4Bdjw" frameborder="0" allowfullscreen></iframe>

 

[geoffdown]

Top man, you were right! :thumb2:thumb2

<iframe width="425" height="349" src="http://www.youtube.com/embed/Am9Jvj4Bdjw" frameborder="0" allowfullscreen></iframe>

only sometimes:lol:thumbs

 

[NITROX]

Top man, you were right! :thumb2:thumb2

<iframe width="425" height="349" src="http://www.youtube.com/embed/Am9Jvj4Bdjw" frameborder="0" allowfullscreen></iframe>

Fantastic!
cheers guys.

nothing wrong with mine, i was thinking it would work like normal axle and 'lock' up when one wheel spinning.

cheers again
steve

 

[lacroupade]

Fantastic!
cheers guys.

nothing wrong with mine, i was thinking it would work like normal axle and 'lock' up when one wheel spinning.

cheers again
steve

You and me both mate - but its why I keep poking and questioning, sometimes I'm right and sometimes I'm wrong and I get a lot of stick, but we usually end up with a definitive answer and learn something new - I bet half the members on here would have assumed as you and I did!:thumb2

 

[solarman216]

LSD is what it says, limited slip, what this means is due clutch plates in the diff one wheel that is on a slippery surface will have a braking force applied so inducing a drive to the wheel on a good surface, this is good off road (not as good as a locker) but on road it means that enhanced tyre wear will detract from long tyre life, that is why it is very important to have exactly matched tyres on the rear so that straight ahead no diff slip is produced, but if mismatched slip will be occurring, which means effectively one rear wheel will be turning at a different rate to the other which will produce a retarding effect to one wheel which means accelerated tyre wear, as well as higher fuel consumption, Rick