I had a Yanmar salt water cooled engine in the sailboat that I built in 1977. In 2007, after 30 yrs, the owner worked at a Yanmar dealer, so with easy pricing, he repowered. His teardown of the original engine revealed no problems after 30 yrs, and he said it likely would have gone another 30 before the salt buildup or corrosion would have ended its useful life.
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Keith
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