Re: winterization 1964 merc 85hp ob
You could pump some through the flush port on the lower part of the leg, down by the lower unit. It says "flush" next to it. I personally don't bother because all the water drains back out on the entire system anyway, and should be dried out before the cold stuff hits. I have a 63 Merc 85 horse, and havn't had any freeze problems. Good luck...