2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 63Get this manual
MAINTENANCE SUBMERGED ENGINES
SUBMERGED ENGINES
Once an outboard has been submerged in fresh or salt water, it must be serviced within three (3) hours of recoveryImmediate service can minimize the corrosive affect that air has on the polished surfaces of the crankshaft, connecting rods, and internal powerhead bearings
Disconnect fuel supply hose from outboardDrain and clean all fuel hoses and fuel tanksRefill fuel tank with fresh fuelClean or replace fuel filter element as neededInject small amount of outboard lubricant into spark plug holes and install new spark plugsReinstall all removed or disconnected partsRun the outboard below 1500 RPM for one-half hour on 25: fueloil mixture
IMPORTANT: If outboard cannot be started or serviced immediately, it should be resubmerged in fresh water to avoid exposure to the atmosphere
Engine Dropped Overboard (Not Running)