Hi, I have just bought a 2007 Corsa 1.7 CDI and I decided first job was to service it and cambelt change. Its the Izuzi engine and I have sussed out how to lock the cam and pump but I can't seem to work out the timing marks on the crank. There seems to be a mark on the pully but I can't see any aligning marks on the engine case. I can only assume its maybe 12 o clock but without a mark to line up it still seems a bit vague. Can anyone shed any light on this, many thanks, Andy.