There is a problem with the starter motor (pre-engaged). I had it down and took it to a specialist, as i saw that both the bendix gear and the solenoid was new, and he said it worked fine, but it does not in the car.
When i try to start, it seems ok, untill the engine tries to start, then the starter disengages, so i never get it started.

Is this a normal behavior or what can be wrong?
I´m not too keen on buying a new or refurbished starter motor, if i can solve the problem with the old one.