Strange one this.Replaced the timing belt in my 96 1.2 60sx Punto about 5 months ago.Since then when you start it you will hear a metallic rattling sound coming from the timing belt side of the engine.It doesn't happen all the time,which is strange,some days it won't do it at all?If i was to describe the sound it sounds like a small steel ball rattling about in a small steel box?Anyone any ideas?