I'm not sure exactly what its called, but on my 1987 Evinrude 140 VRO motor there is a cover plate in the midsection of the motor. It is held on by 4 bolts and is about the size and shape of my hand. Mine is corroded and I want to replace or repair it before water gets in. But I'm not sure if there is already water inside by design. Or is it supposed to be dry? When I take it off will oil come out???