I have a 70HP 1990 Evinrude I'm replacing the water pump on. It came with an O-ring part number 310585 - #58 on the BRP diagram. It does not really show where it goes! The manual doesn't even show the O-ring.
It looks like it goes in above the "grommet" on the top of the water pump housing, but that doesn't make much sense to me.
Does anyone know where this belongs?