If you have a Mercury outboard, contact Mercury -- they built the thing. Engine manufacturers have no idea what type of boat their engines ultimately get mounted on so a boat manual would need to have engine information for every manufacturer. That is simply not economically worth doing. So boat manufacturers send an operators manual from the engine manufacturer, a radio manual from the radio manufacturer, and other manuals for the other various stuff on the boat. There generally is not one comprehensive manual for recreational boats. If it is service information for the engine, then the operators manual isn't much help either. You need the manufacturers SERVICE MANUAL for your specific engine.