Changed the timing belt, water pump, and tensioners on an 03 Kia Rio about 3 months ago. Now it seems that the timing is a little retarded without the A/C on and alot retarded with A/C on. So I took the upper cover off and rotated the crank to check the timing mark on the lower pulley against the timing marks on the cams. My question is which mark on the lower cover does the mark on the lower pulley align with for TDC? Any and all assistance would be greatly appreciated. Thanks in advance and have a great day.