[Stillrunning]

Those things can look just fine but if they have any grooving at all it can cause them to fail. I have replaced them thinking I was wasting my time but it ended up solving my problem as did yours. I would throw the part away *if it stoped your over heating why give them to someone who may install it to give them problems. Its always nice when its an easy fix. That Merc pump and set up looks allot like the one on my 1994 150 Johnson.