1988-1992 Mercury Force 5HP Outboards Service Manual, Page 178Get this manual
3Apply sealant (Special Tool NoT-8983) to screw threads4Torque to 70 inIbs(8.6 Nm) Torque in increments from the center outTorque in increments of 25 inIbs(3.0 Nm) NOTE: Rotate crankshaft by hand and check for bindingInstall new spl ine seal to crankshaft
IMPORTANT Apply liberal coating of Anti-Seize Lubricant (Special Tool NoT-2987-1) to driveshaft splines to prevent corrosion Do not use any lubricant which contains copper