Hey,
Do you have the link to the youtube vid in German? I could translate and paste the text in here.
Kind Regards
Matthias
jedi
Well-Known Member
Seems to make it more fluid, if mixed with the fluid in a pot it does combine together....makes it thinner and more oilly like...its also a lot less sticky... its actually looks revitalised. .
But getting it to mix in the vcu properly is a problem.
Its coming out better...but not sure if turps is ideal...might try paint thinners on the fluid tomorrow
galwaymick
Member
I have been reading this with intrest and so last weekend I finally got the disc cutter on one of my old vcu's I cut the top plate off and removed all the plates from inside the housing (50 in total). The fluid was so thick that I had to use over 2 liters of petrol to thin the fluid enough to remove all the plates. For your infomation I could not turn the spline by hand until I had all but the last 2 plates removed.
I then steam cleaned the plates and housing to ensure that all fluid was out.
I have ordered some 30,000cst oil from ebay and will refill and weld back the 2 halves of the assembly when Im next at home (probably another 2 weeks).
Will also take some pics and try and post them up here.
I then steam cleaned the plates and housing to ensure that all fluid was out.
I have ordered some 30,000cst oil from ebay and will refill and weld back the 2 halves of the assembly when Im next at home (probably another 2 weeks).
Will also take some pics and try and post them up here.
jedi
Well-Known Member
That's great stuff...I was thinking about cutting mine open as its a pain to get the old stuff out...there seems to be sweet spots where the holes in the disc must align and then it passes through more...pics of what's inside would be helpful too....mines slowly freeing up but still a long way to go....need to try something other than turps I think...
GrumpyGel
Well-Known Member
If its not going to be opened, you'll probably lever to turn it by hand or a motor on it so that it agitates the insides and gets thinners into where they're needed.
Prob need to fill it with thinners, block the holes - then give it a good spin! Then see what comes out!
Prob need to fill it with thinners, block the holes - then give it a good spin! Then see what comes out!
jedi
Well-Known Member
Update..
Ive got my vcu to the point I can now turn it with both hands....it has really freed up now...There is still old fluid coming out if I force air into it, but I may just leave it there....the turps substitute I was using works great..it combines with the fluid when mixed and seems to act like a lubricant....
Now I need to put something back into it.....initially I was thinking a 60,000 Cst...but I thinkbi will play it safe and go for a 30,000 Cst viscosity. ...I would like the vcu to be loose..I dont want any unwanted pressures on my ird/rear diff etc....its all going to be trial and error..but I have a feel of how I would like the vcu to preform now...hopefully I can judge this on the bench...as I know how it was and how it is now, so some where in between would be nice....
Any input welcome
Ive got my vcu to the point I can now turn it with both hands....it has really freed up now...There is still old fluid coming out if I force air into it, but I may just leave it there....the turps substitute I was using works great..it combines with the fluid when mixed and seems to act like a lubricant....
Now I need to put something back into it.....initially I was thinking a 60,000 Cst...but I thinkbi will play it safe and go for a 30,000 Cst viscosity. ...I would like the vcu to be loose..I dont want any unwanted pressures on my ird/rear diff etc....its all going to be trial and error..but I have a feel of how I would like the vcu to preform now...hopefully I can judge this on the bench...as I know how it was and how it is now, so some where in between would be nice....
Any input welcome
GrumpyGel
Well-Known Member
With 50 plates in there, I wonder how much friction would be in there if a couple are sightly out of shape and touching? So the remaining friction may not just be the fluid left in there.
I suppose the resultant force your VCU will apply will depend on what grade fluid you put in and how much you fill it. You could do the workbech test before you put it on the car to calibrate it to a time X% faster than a working normal VCU would take.
If you are producing a 'soft' VCU this would presumably still help on road safety, but you would need to make sure that its was also capable of shifting the car on a 'muddy field'. If it were to just slip in that situation, I think it would soon destroy itself, or at least the fluid you've put in it. If you get it wrong, you might have been better off going 2WD now. Mind you there's quite a strong argument for the original VCU being like that !
I suppose the resultant force your VCU will apply will depend on what grade fluid you put in and how much you fill it. You could do the workbech test before you put it on the car to calibrate it to a time X% faster than a working normal VCU would take.
If you are producing a 'soft' VCU this would presumably still help on road safety, but you would need to make sure that its was also capable of shifting the car on a 'muddy field'. If it were to just slip in that situation, I think it would soon destroy itself, or at least the fluid you've put in it. If you get it wrong, you might have been better off going 2WD now. Mind you there's quite a strong argument for the original VCU being like that !
i found when i did mine white spirit did the trick as it comes out with the silicon it evaporates so you can then measure how much to put back as to the silicon to buy i will try and find it if you are replacing with the 30000
nearly forgot i use compressed air to force the spirit in the vcu
there is listed maybe on this thread the amount you need for a refill and if memory serves me this will do 2 and a bit vcu's
Silicone Oil 30,000cst 30000 T3 Silikonol Syncro | eBay
or 3 bottles of this
[Team Associated] RC Parts Silicone Diff Fluid, 30K(30000cst) / 59ml (5457) | eBay
when i get the time i have another vcu to do but not urgent as i no longer have a free lander i went to the other side
hope it all goes well for those giving it a go
Ron
nearly forgot i use compressed air to force the spirit in the vcu
there is listed maybe on this thread the amount you need for a refill and if memory serves me this will do 2 and a bit vcu's
Silicone Oil 30,000cst 30000 T3 Silikonol Syncro | eBay
or 3 bottles of this
[Team Associated] RC Parts Silicone Diff Fluid, 30K(30000cst) / 59ml (5457) | eBay
when i get the time i have another vcu to do but not urgent as i no longer have a free lander i went to the other side
hope it all goes well for those giving it a go
Ron
fredi250
Well-Known Member
Just returned to this thread after stay in hospital ( new ankle). To find that two friends both engineers and both hippo owners after reading this thread have been very busy they have use of a commercial workshop and so have taken a different route.
They have split the VCU on a lathe removing the end cap. After dismantling and cleaning they have fine threaded the external body ,Then they have made from scratch a threaded retaining ring that holds it back together.
I understand that there were some problems that they seem to have overcome in notching the end cap to take an O ring + O rings in general Plus they are not happy with the grade of fluid there using and the amount. But they do have 2 test units fitted and on the road all ready.
I do wish they would allow me to post video they have made but as there looking to turn this modification into a commercial enterprise there holding there cards close.
Watch the net for announcments
They have split the VCU on a lathe removing the end cap. After dismantling and cleaning they have fine threaded the external body ,Then they have made from scratch a threaded retaining ring that holds it back together.
I understand that there were some problems that they seem to have overcome in notching the end cap to take an O ring + O rings in general Plus they are not happy with the grade of fluid there using and the amount. But they do have 2 test units fitted and on the road all ready.
I do wish they would allow me to post video they have made but as there looking to turn this modification into a commercial enterprise there holding there cards close.
Watch the net for announcments
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jedi
Well-Known Member
I used a turps substitute it says on the bottle...ingredients basically solvent...and yes it comes out nice mixes well too.....
jedi
Well-Known Member
The plates are nearly touching each other from manufacturer..there is minimal clearance between them...less than a knats crack....
jedi
Well-Known Member
Sounds like what the vw lads have done on one of there sealed units http://forums.vwvortex.com/showthread.php?t=5958346
I escaped all this turmoil as I have haldex on mine
Tell them to let you post the video...other wise its all lies....
jonaf
Active Member
I think it will be very difficult to adjust the air pressure inside a VCU because the volume is very small. Adjusting the fluid volume however is the efficient way to achieve the desired amount of slip/grip.
With a slightly soft VCU the TC will aid in getting traction. I am currently running one that is on the soft side and it works nicely for summer driving.
