Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 395Get this manual
RIGHT HAND NON-RATCHETING
19Start cover nut few turns by hand, then using Cover Nut Tool (91-61069) and torque wrench, torque cover nut to 210 Ibft(285 Nm)
aO-ringCover Nut ToolTorque Wrench 20Bend one lock tab of tab washer into cover nut (only one will align)21Bend remaining tabs of tab washer toward front of gear housing22Use Shift Shaft Bushing Tool (91-31107) and torque shift shaft bushing to 30 Ibft(41 Nm)