My friends boat has a 1990 Volvo AQ171C, 4 cylinder, DOHC I/O. The timing belt broke. Upon receiving the new belt, I noticed that there were five marks on the belt. The mechanic at the dealership said that these were timing marks. Two marks line up with camshaft pullies when they are at 12 o'clock. A third mark lines up with the water pump pully. The forth and fifth mark are close together at the crankshaft. My question is where to postion the crank. I tried 0 degrees TDC. It did not crank.