If you do mean 'rattle' and not 'vibrate ' and since you state that it rattled
more than before the crank pulley was changed it certainly sounds like the
replacement is the problem. The water test is pretty reliable too so seems to confirm it. This seems to be the original quality make but you could do a search for a cheaper supplier.
http://www.dmgrs.co.uk/collections/p...mper-lhg100750
I seem to remember something about the landrover/freelander item being the same and cheaper......ISLAND 4X4 rings a bell!