Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 324Get this manual
LOWER UNIT
Check the water pickup screen on the upper housingBlow air through the screen to dislodge any debrisClean the area behind the screenInspect the propeller for cracks, gouged, bent, or broken bladesReplace all bent, worn, corroded, or damaged partsBurrs can be removed with fileALWAYS install NEW O-rings, gaskets, and seals during assembling and installation to prevent leaksASSEMBLING ELECTROMA TIC
Forward and Reverse Gear Assemblies