I am rebuilding a 1985 volvo marine engine and can't seem to get the cam shaft in time. It is belt driven and according to the book (automotive) the timing mark should be on the belt cover. The marine engine does not have a belt cover or any timing marks except on the camshaft belt sproket itself.
Any help would be appreciated.

 

Get the proper book for the marine application, there are obvious differences between the two variants of the motor which seem to make a difference.