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My experience is with trying to reduce noise in Yanmar L48 and L70 powered stuff. With the flywheel end drawing outside air in through a plywood enclosure, oil temp starts to run away at higher sustained loads when temps are above 80F. An 800 to 1600 CFM fan pulling additional outside air...

Based on my experience, the engine cooling fan in the flywheel of air cooled diesels does not move enough air to keep an enclosed unit cool. I suggest you add an additional fan to move air through your enclosure before operating it in warm weather.