Jim Warren wrote:

I don't know the Vitesse water pump, but I have got the workshop manual for
the 2000. If the construction is similar, it proposes the following
dismantling sequence:

Ok, had a fiddle and they're not the same. Of the 3 pumps I had lying
around, only one, from a Mk1 Vitesse engine, had a nut on the end of the
pulley. With this undone, the pulley came off and the impeller and shaft
came out easily enough (from the impeller end). The seal is then easily
slid off the shaft without having to remove the impeller from the shaft
at all (thankfully avoiding the bit from your 2000 manual that sounded
the most daunting). The bearing on this pump feels OK so I won't
interfere with it.

The other two pumps (3 if I count the one on my Vitesse) from Mk2
Vitesse engines don't have any visible nuts, circlips or anything to
undo. The pulleys look to be a press fit and are too tight to shift with
anything I have in my garage. I'm hoping that once their off, the rest
will be the same as for the Mk1.