Reply To: upper crankshaft seal source,66 3hp Evinrude

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May 20, 2022 at 10:22 pm #260164
Dale
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    Solo there is no seal on the top only a slinger.   The slinger diverts any gas oil mix that gets by the bearing to a duct that is connected to the carb side of the reed valve.  That duct must be open so the intake vacuum can draw the excess gas to be re burned.   This is OMC’s oil pumping system, to get extra lube to the main bearings.

    dale