Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 385Get this manual
SUBMERGED ENGINE If barnacles or other crustaceans have attached themselves to the hull, extra work will be required to bring the bottom back to satisfactory conditionFirst, if practical, put the boat into body of fresh water and allow it to remain for ew daysA large percentage of the growth can be removed in this mannerIf this remedy is not possible, wash the bottom thoroughly with highpressure fresh water source and use scraperSmall particles of hard shell may still hold fastThese can be removed with sandpaper10-6 SUBMERGED ENGINE SERVICE
Rod bearing corrosion