1988-1995 Mercury Force 5HP Outboards Service Manual, 90-823263 793, Page 155Get this manual
IINSTALLING POWER HEAD (19888 and newer) 1Install new exhaust gasket on motor leg Align holes in gasket with holes in motor legInstall power head on motor leg Lubricate driveshaft splinesAlign driveshaft splines with splines in crankshaftMake sure spline seal is in place in the crankshaft