1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 45Get this manual
If engine shows evidence that sand or silt may have entered it (sand or silt under the engine cover or slight grinding or scraping when flywheel is rotated), do not attempt to start the engineIt must be disassembled and cleaned Engine Dropped Overboard (Running) Follow the same procedure as Engine Dropped Overboard (Not Running) However, if there is any binding when flywheel is rotated it may indicate bent connecting rod and no attempt should be made to start the engine POWERHEAD MUST BE DISASSEMBLED AND SERVICED IMMEDIATELYDropped Overboard (In Salt Water) Follow same procedures as Engine Dropped Overboard (Not Running) and (Running)Even if engine can be started, it must be serviced (disassembled and cleaned and electrical components cleaned or replaced where necessary) as salt water can cause excessive corrosion of electrical components and internal partsProlonged Submersion (Fresh or Salt Water) If engine has been dropped overboard and not recovered immediately, the engine must be serviced within three hours after recoveryFollow same procedures as Engine Dropped Overboard (Not Running) and (Running)When prolonged submersion occurs in salt water, even if engine can be started, the engine must be disassembled and cleaned and electrical components cleaned or replaced where necessary 4C