I recently got a 1981 90 hp evinrude,runs good but has been out use for some time,im going to replace the water pump impeller,but i've been geting a little water in my oil,I replaced the seals in the fill/drain plugs but still get water.I want to replace all the lower unit seals while i got it off changing the impeller,i've never done a seal job before.<br />So my ? realy is ,is replacing the seals fairly easy or is this something i should have done.