I have merc 100 I thing is 1960 -61 Serial #1351606. A friend sold to me, I was set in garage for 15 years. I traid to star and it work in 2 pull. but it does.not cool well. I traid to repleaced the impeller , I took the lower unit out and ,I fund is different that the 1981 motors. I need same idea how i can take out . Thanks Julio
