TS 2.0 16V 1997 Ph1 engine ticking noise
I've got a strange ticking noise on a Spider 1997 ph1 2.0 Twinspark engine. The noise is periodic, it can be heard ticking just above normal engine sound, ticks for around 5-7 seconds with a slight crescendo in sound, then stops for around 10-15 seconds, then on and off again roughly with the same intervals. This occurs after start up from cold and does not disappear when warm. The noise appears to be coming from the left side of engine around the belts, but at times it sounds like it's from the front right. The engine has done 57K and has been off the road for around 4 years. A fresh oil and filter change has not cured the problem. There is no history of the variator ever been replaced, cambelt, balance belt and tensioners were replaced at 47K.
Any ideas what could be the cause of this strange ticking noise?