Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 368Get this manual
RIGHT HAND NON-RATCHETING
bDrill two 316 in(4.8mm) diameter holes thru the top of water pump cover (but not thru insert)Drive insert out of cover with punch and hammer
aDrill Two Holes at These Locations 7Remove impeller from driveshaft(It may be necessary to use punch and hammer to drive impeller upward on driveshaftIn extreme cases, it may be necessary to split hub of impeller with hammer and chisel 8Once impeller is removed, remove impeller drive key from driveshaft9Remove water pump face plate and both gaskets (one above and below face plate) from water pump base10Using pry bars, positioned and padded as shown, lift water pump base up and off driveshaft51874