Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 384Get this manual
MAINTENANCE soaking the covering until the growth is loosenedAn easy alternate method, of course, is to return the boat to the water, if possible, and then too pull it out after it has been allowed to soakIf an aluminum boat should strike an underwater object resulting in damage to the hull and leak develops, the only emergency action possible is to make an attempt to reduce the amount of water being taken on by stuffing any type of available material into the opening until the boat is returned to shoreThe aluminum cannot be reoaired while it is wetRepair of damaged hull must be performed by shop equipped for heliarc welding and other aluminum workStyrofoam blocks are installed under the seats of all aluminum boatsThe foam blocks are designed for flotation to prevent the boat from sinking even if it should fill with waterOnce each season, the wooden seat should be removed and the foam allowed to drySome manufacturers enclose the foam blocks in plastic bags prior to intallation to protect them from moisture and loss of their flotation abilityNew blocks may be purchased in wide range of sizesIf new blocks are obtained, make an attempt to enclose the block in some form of plastic covering, then seal the package before installing it under the seat10-5 BELOW WATERLINE SERVICE