Before to change the water pump, there is a belt with teeth that jointed to the water pump and to the mediator flange. This belt must be disconnected first. And then whater pump reinstalled after. This is the right reinstallation way. This is the cover, we drag it and now disconnect to take out the belt. Screewing off the water pump's nuts The car details are Auio A4, Motor is 2 Tissay, 4X4.