1981 Johnson/Evinrude 4HP Outboards Service Manual, Page 45Get this manual
DISASSEMBLY POWERHEAD aRemove three screws, armature support plate and retainerNote position of retainerSee Section 4bRemove cylinder head and gasket by removing the six head screwsSee Figure 5-5cRemove exhaust cover and gasket by removing
the cover plate screwsSlide cover out from under starter bracketSee Figure 5-5dRemove lower bearing seal by removing four screwsSee Figure 5-6Drive taper pin out of crankcase and cylinder block assemblyThe taper pin must be driven out from the back to the front of the crankcaseSee Figure 5-6Remove screws attaching crankcase to cylinder block