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The boat owner says there is no air in the lines. Therefore, there may not be an air leak. Maybe there is water in the fuel, but I think he checked for that. Black smoke he says. I would check the injectors, if you have extra injectors, just swap out and see if that takes care if it. You should carry spares anyway so maybe just buy some to have on hand even if it isn't injectors. It might be low compression so buy an compression guage for diesels. This is another one of those things a do it yourself person should have on hand. Check air cleaner and piping for it. Black smoke means too much diesel for the amount of air. If air in lines, there is not enough diesel so no black smoke. Anyway I am thinking injectors. I think Yanmar is a direct injection engine, no pre-combustion chanber, therefore no glow plugs. You need really good batteries to spin the engine hard to get it started.
Last edited by LakeSuperiorGeezer; 11-10-2011 at 06:57 PM.