@muehlpower if you have interest to further a robust seal solution, I have been making effort in US but maybe easier on EU side.
EKK has a very advanced coolant seal designed for electric motors. They have a 30mm ID x 50mm OD sample that can be supplied at volume for $120+. But it is not simple install into existing manifold (even if using a 5mm sleeve ring) Its different geometry, fits onto end of the shaft rather than slide over shaft OD like current seal. Furthermore, since all seals will leak, it is desirable to find weep chamber solution to exit any leaks. Therefore, I am guessing custom manifold is likely. I summarized this seal here (
https://teslamotorsclub.com/tmc/posts/8139931/ )
I have spoken with advanced US water pump design company to integrate this seal. Such experience is desirable as they naturally have experience to consider the key issues. For example : Lacking ICE heat to vaporized the weeped coolant ; Does the face type seal work if rotor has axial movement...
I also contacted EV Clinic and president told me they have this type of seals from ZF. He called this type seal clutch seal and said ZF is inventor and has patent. He has many samples in stock and can sell 200 EUROs each. But he isn't interested because he claims to have tested dual lip graphite seal for 250k kms (
https://evclinic.eu/product/30x55x8-tes ... -lip-seal/ ) I asked what about shaft surface condition and didn't receive any reply.
I still worry about squirrel cage rotor longevity after coolant delete (I did to my car since shaft become damaged and couldn't find any solution) But no induction motor design engineer is providing any thermal longevity analysis.
Finally, sorry I removed all my prior post. Tesla is $1T value company. LDU coolant leak problem is inviting class action lawyers from US side. Some contacted me and I don't want to be involved.
If you have interest to introduce ZF or EKK seal to water pump designers to find a solution in EU. PM me and I can connect you to EKK and EV Clinic ZF seal source.
However it is becoming more difficult to make progress developing good seal solution. Everyone is following Tesla coolant delete. If rotor failure become real, sourcing rotor will be very difficult.