Horrible noise

I have a horrible rattle noise from the front of the engine on my TD5. It does not follow engine revs and may get less with higher revs. The harmonic damper has been changed but I was surprised at the play in it. A little transversely and about 3-5mm longitudinally with a knocking sound, measured against the crankshaft pulley. Is this amount of play ok or are there any other ideas?