Reply To: water flow on a 67 100hp evinrude

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September 12, 2021 at 1:15 am #246518
frankr
Participant

    There is an exhaust relief hole part way down the back of the midsection. Water will blow out that hole, the amount varying according to thermostat state, but always at least some water. Forget muffs, even if they would fit. You cannot test a water pump by running on muffs.