Editing – looks like three of us were typing/posting at the same time – sorry for the duplication!
You will find exploded views and parts lists for your 1957 3 HP at the link below. These are simple motors so you may not need manuals. There is no telltale cooling water stream – just some spray about half way between the powerhead and the cavitation plate. Use gear oil (not grease) in the gearcase. Use 16 to 1 gas/oil mix. If it still has original coils, they will be bad – insulation cracked, etc., but if it’s been used in the last 20 or 30 years, the coils have likely been replaced.
Dave
Here are the views and parts lists:
http://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1957&hp=3&model=JW-13
