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Kohler 7.5R generator burns up impellers?


I have a 7.5R Kohler gasoline generator in my 88’, 3807. Last spring on first startup, I smelled rubber. Raw water impeller disintegrated. I’m talking dust. Changed it out and did great all season. Ran it maybe 10 hours for the whole season. Checked it this spring, looked great. Pliable and no cracks. Ran it 2 or 3 times, maybe an hour so far this season. Last run, I saw heavy steam coming out the exhaust after a couple of minutes of start up and smelled burning rubber again. Shut it down and expect I’ll find smoked impeller again. Any thoughts? I winterize with pink antifreeze. I noticed it is alcohol based, but not sure if I’m ready to say that eats on the rubber. Any thoughts or experience will be much appreciated.
Vic

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