Ok tested and all fine. Main bearing cap does not move when declutch.
Made the setup and the cranckshaft was moving freely. I took out the axial bearings and had a feelergauge between the cranckshaft and main bearing cap. This to have all the pressure at the top of the bearing cap. In real situ the force is going to be equally devided on the total cap area but i thought to test on the most weak spot and to have the most momentum as possible to have a max extreme test effect. When declutch the max pedal force is about 300N average at different tests and to hold the clutch a force of 180N is needed. Hurray for the diafragma clutch.
There was zero movement of the cap.
When taking off the clutch/flywheel and replaced the releasebearing by a sprint one i could have the force directly at the cranckshaft. At 200N pedalforce the gauge began to move. At about 700N there was a movement of the cap of 0,06mm. The max movement to achieve was 0,10mm.
There wasn't time enough to measure the real forces on the cranckshaft because it was getting dark.
I'm going to proceed the mod because the cap will never move when the total axial force is at the original bearing and the new upper one. As the bearing cap isn't pushed away the bearing is going to work as an actual extra axial bearing.
Jeroen
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