Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 199Get this manual
GEAR HOUSING
2Drive lower drive shaft needle bearing into gear housing, using bearing removalinstallation tool
91-17351
aLower Drive Shaft Needle Bearing: Installed on End of Driver RodGuide Bushing: Seated in Water Pump Cavity of Gear HousingDriver Rod: Tap in with Hammer Until Head of Driver Rod Seats Against Guide Bushing