Yeah, as I have a bit more time, I might as well give it a try. I studied O-ring sealing a bit today and that was quite informative. Seems the best way is to measure the groove (diameter and width) and bore diameter and calculate the right O-ring from there.
Tomorrow I will need to remeasure the steering rack connection diameter, as today, in the dark, I didn't get reasonable numbers
In my other thread I had shown a few available adapters. One of them with double O-ring. From what I have learned now, that is actually worse than the OEM setup which has a backup / support ring and the actual sealing O-ring. The function of the backup ring is to prevent the O-ring from deforming under pressure, being pushed into the space between steering rack and adapter.
Part of the selection is also on material used. Basically either Viton (as OEM) or NBR. In my application I see no reason that NBR is insufficient. Real strength of Viton seem at high temperature, but with the electric pump I should never get there (doesn't flow that much as the engine drive pump does at high RPM and no longer in the hot engine compartment).
To be continued.
Threaded Mode
