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post #15 of Old 01-27-2013
bjung
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Re: Yanmar 3GM30F HP one-hour rating (??)

One point of caution about RPM gauges. Most of them will give you a faulty reading, either because they are off, or calibrated incorrectly. I checked the RPM gauge on our boat with a meter at the crankshaft pulley and it turned out to be reading 380 RPM too low. So running at max RPM would be a short lived experience, followed by an engine rebuild.
In 30 years of working with diesel engines, I haven't found an accurate gauge yet. They are all off, some more than others. Beware.....

Last edited by bjung; 01-27-2013 at 06:30 AM.
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