Re: 1971 mercury 200 20hp gearcase leak

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November 12, 2016 at 6:48 pm #47340
outboard315
Participant

    That doesn’t sound right, but it may have a bad seal or internal crack. I would drop the lower unit and have a look. Just to weed out the aaaha moment, there is the oil screw in the front of the lower unit with a vent somewhere above it and the oil is conning out the multi holes about center on the sides.