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    what causes water to come out of vent hole on thermostate cover on 1981 40HP MERCURY outboard motor?

    0  Views: 427 Answers: 1 Posted: 13 years ago

    1 Answer

    You are not going to know the specific cause until you get in there and look. It could be just a loose, or cracked fitting, broken seal, or worse. But, if it is streaming out of it, you know you have to fix something in that area. The vent is just the path of least resistance.



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