Status report: T4 Syncro Viscous Coupling
As recently requests for overhauling the T4 viscous coupling are piling up, we want to give you a short overview, what we are currently working on and what the main […]
Author: kern
In which situations is a Viscous Coupling active?
As we mentioned in the last section of this blog article already, a working viscous coupling will always relieve the gear box from a certain amount of load – even […]
Is the VC of my T3 Syncro still working after 300.000 km?
Inquiries like this are quite common, since the intended functioning of a viscous coupling often could not be experienced.
Selecting the right gear oil
We are frequently asked which gear oil we recommend for the T3 Syncro. The official VW guideline from the ‘80s speaks of 75W90-GL4 for differential & transmission. But our recommendation […]
Decoupler as gas guzzler
First of all: It’s not our intention to make the decoupler look bad – we also fitted one, and think it’s a nice gadget – but we prefer to drive […]
After a VC fails closed, it then fails open.
We suspected this issue for a long time, but now we found evidence to support our theory. But let’s tell the story from the beginning. A customer brought us his […]
Are blue or black quad-rings better?
Answer: Totally equal, you should better pay attention to other things…
“Oil-sucking”- a design failure of the T3 VC
The other day I could examine another tiny part about the “oil-sucking” issue. My understanding is, that it’s a design failure, where the extrem high thermal expansion of the silicon […]
Why does an old viscous coupling stink so miserably?
Anybody who already opened an old VC knows what I mean – the offensive smell of the deep black silicone fluid. But why does it stink so badly?
Testing of a “baking oven VC” #2
After having tested a so called baking oven VC months ago, I decided to test another one due to verification resasons. I got the baking oven VC from a german […]