Well, I wouldn’t use it unless you want to pull the lower unit off and drain the water before you put it up for the winter. Maybe some others with more experience will weigh in on this but I’ve never seen or heard of one that had a bad casting at the drain passage. I’ve had to drill the passage on every one of my motors and just found them plugged up. A couple drilled very easily and quickly but my QD-20 and RD-18 both took a lot of work to clear them out. When you drilled yours, did you get any dirt/debris on the drill bit or did you get aluminum shavings?
Edit – you say you drilled in the “hole”. From your picture, I assume you mean you drilled from the top of the case down into the drain passage and not into the drain hole itself?
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
