Yes I also heard from the problems with water pumps.
Here is a video from a guy who has also this problem:
VW Touareg Cold Start Problem - YouTube
The problems seem to happen more frequently with the Transporter R5 engines. Maybe because the angle which they are built in is different?
The first R5 engines are the BAC engines. But later they have made the BLK, BPD and BPE. But which is the best?
I've read that the first types of engines had only one bolt to mount the injector and the younger models have 2 bolts to mount it. I looked at the design from Elsawin but they all have just one bolt.