1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 286Get this manual
Draining and Inspecting Gear Lubricant WARNING
If gear housing is installed on outboard, disconnect (and isolate) spark plug leads from spark plugs before working near the propeller1With ge ar housing in normal running position, place cle an pan under housing and remove vent plug and filldrain plug (with gaskets)
Propeller Removal
WARNING
If gear housing is not removed from outboard, before attempting to remove or install the propeller, remove (and isolate) spark plug leads from spark plugs to prevent outboard from starting1B end tabs of tab washer (a) away from nut (b)