Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 473Get this manual
ATTACHMENTSCONTROL LINKAGE
Lubricate ball joint in steering eyes, with SAE 30W Motor OilAssemble steering coupler between outboard steering arm extension brackets, using special washer head bolts (10-14000) provided and nylon insert locknuts as shownIMPORTANT: With assembled steering coupler installed and before tightening special washer head boltslocknuts, check outboard alignmentDistance between centers of special washer head bolts MUST BE equal to distance between propeller shaft center lines, for proper steeringIt adjustment is necessary, temporarily remove special washer head boltlocknut from one steering eye and turn eye in or out to correct alignmentTorque special washer head bolts to 20 Ibft(27 Nm), then torque locknuts to 20 Ibft(27 Nm)