1975 Evinrude 40 HP Outboards Service Manual, PN 5093, Page 17Get this manual
SUBMERGED MOTORS If motor is lost overboard while running, it should always be disassembled before any attempt is made to start itOften internal parts are sprung and running under these conditions can result in permanent damage
A motor lost overboard in salt water should always be disassembled and cleaned before starting is attemptedSome materials used in modern engines are subject to very rapid corrosion in the presence of salt water and should be inspected to determine if replacements are requiredA motor lost overboard in fresh water can usually be safely started if recovered within twelve hours providing no sand or silt is present