Not good. It seams the previous owner has mis-matched some parts.
Maybe you have a RWD waterpump, with a FWD waterpump pulley. In this case, you need to buy a RWD waterpump pulley either new from Toyota, or secondhand. The part number to buy this is in the Tech Articles section.
There are other posabilies. It is probably due to mixing FWD and RWD parts.