Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 436Get this manual
LEFT HAND NON-RATCHETING
4Position the reverse gear (without the thrust race or thrust bearing) into the gear housing and into the adaptor5Install PILOT RING (91-18603) over DRIVER TOOL (91-18605) and seat pilot ring in gearcase against inner ledgeThread RETAINER (91-18604) into bearing carrier threadsInstall SCREW (10-18602) into retainer and gently tighten screw against driver tool while holding retainer securelyContinue to apply pressure against driver rod until reverse gearbearing cup adaptor JUST SEATS in gearcaseDO NOT OVER-SEAT the adaptor as the reverse gear bearing will be damagedAs bearing adaptor begins to seat, the effort required to turn screw will increase considerably55100