1992 Johnson Evinrude "EN" 60 thru 70 Service Manual, P/N 508144, Page 38Get this manual
rN=J If engine shows evidence that sand or silt may have entered Engine Dropped Overboard (Running)
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