Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 397Get this manual
RIGHT HAND NON-RATCHETING
7Slide impeller down driveshaft to impeller drive keyAlign drive key with keyway in the center hub of impeller, and slide impeller over drive key8If removed, install new water pump insert into pump cover as follows: aApply Perfect Seal to water pump insert area of pump coverbInstall water pump insert into pump coverVerify that tab on insert enters recess in pump covercWipe any excess Perfect Seal from insert and cover
NOTE: If holes were drilled in top of water pump cover to aid in removal of insert, fill holes with RTV Sealer or equivalentAllow to cure, 24 hours prior to operating engine9Install water tube seal into pump cover, being sure that plastic side of seal goes into cover first10Reinstall water tube guide into water pump cover11Apply light coat of Quicksilver 2-4-C wTeflon Marine Lubricant inside of water pump insert12Position assembled water pump cover over driveshaft and lower over water pump studsRotate driveshaft in clockwise direction (viewed from top), while pushing down on pump cover to ease impeller entry into cover13Install water pump cover retainer washers, nuts and bolt