Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 438Get this manual
LEFT HAND NON-RATCHETING
9Install bearing race and bearing retainer
aShim(s)Bearing RaceBearing Retainer (Word "OFF" must be visible); Torque to 100 lbft(135.5 Nm)Bearing Retainer Tool (91-43506) 10Use socket and breaker bar to hold pinion nut (pad area where flex handle will contact gear housing while torquing nut)11Place Driveshaft Holding Tool (91-34377A1) over crankshaft end of driveshaftTorque pinion nut to 75 Ibft(101.5 Nm)