My waterpump impeller has seized onto the shaft is there any way to free it as i need to removed the knackered plastic gear tia dan

What Mk do you have?

Mk3 pal i also have a cracked plastic gear so if anyone has a spare id be very greatful

How badly is it cracked? Are there teeth missing/damaged?

Almost every CRM engine that I have taken apart has some degree of cracking. Unless it is bad then I would tend to leave alone.