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DrB,
I am trying not to regurgitate too much of what was said previously... but my guess is that there is not a problem. You are nowere near a life on that engine unless it has been badly abused. I agree with the poster above that said you are not cruising it high enough. RPM should likely be higher. In reality, most cruisers do not run their engine at those rpms because of the vibration and fuel efficiency, but check with Yanmar - they will likely tell you that it needs to be run at higher RPM's, at least periodically. That is what I do. I hate running that clap-trap at high rpms. I am comfortable with about 22-2400 on my 4jh4e, but that really is not the right rpms. So, every once in a while I get the engine up to WOT for a minute or two to blow it out, then come back down.
The smoke is not all that unusual if you do not WOT on occasion, or run it at lower RPM's for extended periods. You can always do a compression test if you feel it is necessary. But if the cooling and oil look good (and the diesel, VERY IMPORTANT AS YOU MAY BE BURNING JUNK OFF IN YOUR DIESEL), you are probably fine.
- CD
PS Just blame the wife for missing the mark (HAHA, just kidding).
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