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At 1200 rpm the 71 series engines in generator applications were actually pleasantly quiet. A 6-71 only made 75 KW in that configuration, though.

If I ever rebuild another 71 series I'll ditch the gaskets on the end sheets and use Loctite 515. The last two 6-71 engines I built had the check valves on the airbox drains and a catch can. They were relatively clean. I made an error building the blowers on both engines and missed a spot when...

Is it slobbering out the air box drains? This is normal. There are check valves you can install that close the drains when the engine is running.