1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 223Get this manual
6 Remove bolts securing gear case to drive shaft housingRemove cover gasket, base plate and base gasket
NOTE: If water tube seal remained in drive shaft housing, remove seal from housing and reinstall on water pump coverSecure seal to cover with Loctite 4057Remove bolts securing pump cover
a Cover Washer (above impeller) Impeller Key Washer (below impeller) Cover Gasket Base Plate Base Gasket