Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 478Get this manual
ATTACHMENTSCONTROL LINKAGE
Lubricate ball joints in steering link rods with SAE 30W Motor OilSecure link rods to outboard steering arms, using special washer head bolts (10-14000) provided and nylon insert locknuts as shownTorque special bolts to 20 lbft(27 Nm) then torque locknuts to 20 Ibft(27 Nm)