is it a big job replacing the water pump on my 1.9 tdi classic

If you know how to change the cambelt and have the correct engine locking tools, it's a piece of cake - 3 bolts and some G12+ coolant.

If you are not fully familiar with the cambelt change procedure and don't know how the front is pulled into the service position to gain access, leave it to a competent independent.

Change the water pump at every cambelt change and fit a pattern pump with a metal impeller.

rotodiesel.