Old 08-23-2020, 12:24 PM
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Join Date: Aug 2004
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It is normal for the turbo paint to discolor. It shows you are loading the engine. As long as all sensors work and read in the correct range, no problem. Marine Diesels do not like to be run over loaded. They need to get above WOT rating, fully loaded. My Yanmar 4LHA-DTE was rated at 3,300 rpm. Recommended WOT is 3,450 to 3,500. Your QSB is rated at 3,300 rpm and needs to reach 3,450 rpm's WOT.