1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 334Get this manual
Reservoir Installation 1Torque end cap screws to 13 lb in(1.5 Nm)
5Secure reservoir to manifold using four screwsTorque screws to 70 lbin(7.9 Nm)
6Install lubricated O-rings and "E" clip to manual release valve51486End CapO-ringScrews (4)
2Place drive shaft into oil pump3Install lubricated O-ring to base of reservoir4Carefully guide (with motor) down onto drive shaft51196