Replacing the water pump on a VW T25 Transporter is a pretty tough job not because it is technically challenging but due to the very restricted access to the major components, pipes and bolts. One of the Allen bolts holding the smaller coolant pipe flange to the pump, for example, could only be given a 1/8th turn before having to take the key out, re-position and turn again. This procedure had to be followed both when taking the bolt out and screwing it back in again.