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I just recently bought a 1968 13' whaler sport (I believe, it has the side steering console) from the grandson of the original owner. It has the original 35 horse chrysler on it. The boat and outboard are both in great shape for the age. To my amazement, after sitting for seven years, it fired right up and purred like a kitten. Now the question. Take the outboard off and lay it propeller side down and carb side up. Where the lower unit attaches to the shaft of the engine, there are four bolts. With the outboard sitting how i just described, look up the shaft of the motor so you can see all four bolts. Near the "Upper left hand" bolt and nut, there is a tiny pinhole. It was very clearly put there for a reason and not damage or an aftermarket modification. This hole is leaking oil and exhaust. What is it for and how do I stop it from leaving an oil slick on the water surface?!?! Don't worry, It was tested in a 55 gallon drum. I like clean lakes. Any help would be great. I know this is an old boat but I see a lot of life left in her.. Just gotta keep the oil in and water out
(moderator note: please follow guideline #1 on the front page and use the full 4 digit year)
I purchased the parts and service manual for my 1979 235hp Evinrude outboard a couple years ago from "marineengine.com". They have quite an archive of literature and parts. Interesting company. Today I ordered from them a rubber boot, control button, and applique for a 1996 OMC throttle control handle. Dinky parts that were available. I already had them up on the web for my order and it looks like they have manuals for your motor. There number is (800) 209-9624. Good luck with the boat.
gchuba
edit: When trouble shooting some issues with my motor I chatted with (and bought parts from) an "old timer" with "Lockemans Hardware and Boats" out of Detroit. You may want to give them a shout about the "pin hole". My old 235hp Evinrude had a trickle of water out of a section of the cooling system. The volume of water had me suspect blockage but Lockemans explained it was part of the early engineering.
I don't know anything about this particular motor, but pretty much all old school 2-strokes drool fuel mixture, some more and some less.
Check for fuel leaks around the carbs and fuel pump. An improperly adjusted carb float or damaged needle valve will also cause extra leakage.
Don't know what your fuel tank setup is like, but a portable tank in the sun, with the vent cranked tight shut, can generate enough pressure to force fuel past even a properly seating needle valve.
I do apologize. I did read the guidelines. Just a habit I suppose. And thanks guys for the info. Every little bit helps at this point. This motor is almost 20 years older than I am. Things are getting tough to find for it. Especially knowledge