The boat originally has a Kohler and the previous owner replaced it with the onan. They left the Kohler hour meter. So not sure.
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Fellow viking here 😊 Well at least I'm Norwegian... I am in the same situation, needing a new heat exchanger for my Onan mdl4. I saw you had the spare parts list, Viking. Is it possible for you to pm me this picture in perhaps better resolution? Do you know where I can get my hands on one?Thanks Kristian