Thread: BW Viscous Transfer seized

My apologies gentlemen

I miss read the sheet on this thing, I skimmed it and looked at the picture then automatically slipped into ahhh its half an LSD..

Having read the manual properly this time... (nother vote for nuff nuff for me) ID still suggest the drain and flush which will tell you if the thing is leaking out or not, if its not leaked out it shouldnt be failed but will give the impression of being siezed if the diff is also u/s...

given some extra lubricity (ie the diesel)if the diff is stuck then it might free up.(the diff, not the VC

Originally Posted by Blknight.aus

My apologies gentlemen

Having read the manual properly this time... (nother vote for nuff nuff for me) ID still suggest the drain and flush which will tell you if the thing is leaking out or not, if its not leaked out it shouldnt be failed but will give the impression of being siezed if the diff is also u/s...

As has been mentioned VCs are sealed so cannot leak out. Most VCs fail due to old age or over work - with age or overwork the fluid inside begins to harden so the VC tends to remain locked - over time the fluid hardens so much that the VC is permanently locked. On current design there is not much you can do except replace.

I have a dead VC at home that when I have some time I am going to drill some holes in the outer case and see if the "dead" fluid can be removed and refill with some new stuff and see if it works as I cannot understand why they cannot be reconditioned particularly given their price. All the stators and rotors inside should still be OK.

Unfortunately at this point in time they can only be repaired by replacement.

Gazzz

Originally Posted by Blknight.aus

Ummm, isnt the VC in these ones the one that looks and works like an cone clutch LSD, or am I reading the exploded diagram wrong or looking at the wrong thing....

ummmm........its basically a torque converter [like in most automatic transmissions] but filled with a silicon based fluid that gets hotter when slippage occurs, when the fluid gets hotter it gets thicker and denser and thus allows less and less slippage as it gets hotter and hotter.

It works on the same principle as the engine radiator cooling fan clutch.

It's a sealed unit and not repairable - but a second hand one with a warranty is certainly worth a try.......or fit a Lockable Centre Diff type Transfer Case instead. if you want to.

Not to mention the very high rate of tyre wear, esp on the front!!

A recent repair in this area took me to Ashcroft Transmissions.

Before you buy in Oz, check what a VC & output shaft would cost landed from UK.

www.ashcroft-transmissions.co.uk, I think. They have a very good help desk.

HTH

Pete

My viscous died recently, so i converted to a lt230, easyish job and heaps better off road.
Try triumphrover for second hand box and conversion kit.

Originally Posted by Blknight.aus

My apologies gentlemen

I miss read the sheet on this thing, I skimmed it and looked at the picture then automatically slipped into ahhh its half an LSD..

Having read the manual properly this time... (nother vote for nuff nuff for me) ID still suggest the drain and flush which will tell you if the thing is leaking out or not, if its not leaked out it shouldnt be failed but will give the impression of being siezed if the diff is also u/s...

given some extra lubricity (ie the diesel)if the diff is stuck then it might free up.(the diff, not the VC

A little less time answering straight from the text book would help with these errors

Now im intigued into this thing............. It looks like a bloody clever idea and to me would be perfect if used in conjunction with a normal center diff lock.

From how I read the manual


It (the VC) couples onto the front drive side of the center diff and the carrier of the center diff to limit but not totally eliminate the movement of the differential gearing.

Ok so that makes it effectively the same as an LSD but its outside the diff... Or have I got that wrong?

If I got that right, If the Center diff siezed would it not also give the same effect as a siezed VC?

If the goop they use in the VC is the same as viscous fan drives from memory doesnt that stuff get thinner with age instead of thicker or were you guys using that as a comparison?