There is also video's on YOU TUBE of the water pump being changed.

I was at the junkyard & it is easy to access and see the water pump, when the motor is out of the car. The wheel or turbine in the water pump is made out of some kind of plastic (that is what it looks like to me). You would also understand the NEED for the tool if you are NOT changing the timing chain or parts.

The NEW ECO TECH MOTOR that is in the turbo charged-rear wheel drive-ATS, uses this location to drive the second high pressure fuel pump.