The change was carried out in 30 minutes, vacuum cleaner sucks again: -D
Quick Start Guide for the Dyson DC05: the upper cover on the hinge lever out, pull both wheels, then 4 Torx screws are visible. This and the highly visible screw top Remove (5 screws are loosened). Everything else is self-explanatory. If one uses the new engine, first insert the rubber bushing in the lower plastic part and then let slip into the motor.