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Engine tear down, reassembly and tuning
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Disassembly complete. Check out your cooling passages.
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I've drawn this one out because it's such a common problem on both 3 and 4hp Johnson/Evinrude engines from the 50s, 60s, and 70s. This is the complete cooling water circuit. If you click on the image, you'll see that there are actually two parallel circuits. One that bypasses most of the block and primarily cools the exhaust, and a much more constricted passage around the cylinders themselves.
All too frequently, the small passage out of the cylinder jacket area gets blocked causing the engine to run far too hot. Make sure at this stage that all these passages are clear.
The bypass passage over the top of the block has a tendency to clog as well, since it's at the top. If the cooling system is weak, the top of the block gets the hottest. In a salt water environment, calcium carbonate will precipitate out of the seawater especially quickly when it's heated above about 60�C. So this passage frequently ends up clogged with calcium carbonate on neglected outboards.
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All projects on Shareaproject.com are user-submitted and should be used for reference information only. The projects are not intended to be complete "How-To" articles. Use the information contained in these projects at your own risk. Projects are not checked for completion, accuracy, or safety and therefore cannot be guaranteed in any way.
Outdoor Blog
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