someone suggested getting a whole new water pump complete with pulley but again where from?
The pictures look like a standard BMC vehicle pulley (if there is such a thing) and I think the drive flange that is normally fixed to the shaft has come away with the pressed metal pulley still attached. I think you will find that if you undo the four hexagon setscrews/bolts you will have a light metal pulley and a heavy drive flange.
Looking at it I suspect the drive flange was originally pressed onto the pump shaft (Its the first one I have seen that has fallen off) so I think this will be easy to solve as long as the shaft/drive flange has not worn too much.
If you can find you have to tap the flange back onto the shaft with a soft hammer or mallet then I suspect a de-grease of the surfaces, a generous application of Loctite stud & bearing lock and leave to set will solve the problem.
If the flange slides over the shaft but is still a fair fit it might be worth centre punching the shaft all around it and along it length to "increase the shaft diameter". Then tap the flange on with Loctite as above.
If the shaft is a sloppy fit and centre punching is ineffective then I fear it will require the flange to be welded onto the shaft. First tacked and checked for truth and then welding.
ASAP Supplies list the pumps and the drive flange should be fitted when you receive it. www.asap-supplies.com 0845 1300 870 or 01502 711 680. They are in Beccles.
Edited to add:
PS if you want me to have a look ring 01189874285.
Edited by Tony Brooks, 05 April 2010 - 03:17 PM.