Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 22Get this manual
MAINTENANCE
Protecting Internal Engine Components
NOTE: Before performing Steps andmake sure the fuel system has been prepared for storage
1Change the engine oil2Place the outboard in water or connect flushing attachment for circulating cooling waterStart the engine and let it run in neutral to warm up3With engine ru nning at fast idle, stop the fuel flow by disconnecting the remote fuel lineWhen engine begins to stall, quickly spray Quicksilver Storage Seal into carbu retor until engine stops from lack of fuel4Remove the spark plugs and inject five second spray of Quicksilver Storage Seal around the inside of each cyli nder5Rotate the flywheel manually several times to distribute th storage seal in the cylindersReinstall spark plugs