Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 225Get this manual
6 Inspect the water pump face plate and the water pump interior for roughness andor groovesReplace the appropriate components if any are found
OIL SEAL CARRIER ASSEMBLYCOMPONENT DISA SSEMBLY
Note: Complete the instructions in this section only if the assembly components have been found to be defective and are in need of repair or replacement1Remove the O-ring
Oil Seal Carrier Assembly
REMOVAL
1Remove the oil seal carrier from the gear housingIt may be necessary to gently pry up on it with two screwdrivers