My raw water pump just managed to break a screw head.

Went down to the boat, yesterday... basically to just get out of the house.

Well I know I have a small freshwater leak, so I figured, since I was here... So I traced it, found a loose clamp and tightened it. Fine. One problem fixed.

Glanced over at the raw SW pump and just ran my hands over it... Thinking about a friend's recent admonishment to change the impeller. Just then a small corroded screwhead fell into my hands. Uh oh. I felt the face of the pump (which faces away from me on this Yanmar 2GM20F) and sure enough, one screw was missing. Talk about fortuitous... better now than a failure while underway. I have spare impellers... but the screws... uh, no.

Well oddly this pump is made in Sweden... lets see... Japanese engine, Swedish pump... how in the world does that make sense? (uh, no doubt "metric..." )

Anyway I was able to find some M4-80 ss socket head cap screws locally... but I am wondering if silicon bronze would be better. The old ones appear bronze. I did a web search... but sites seem to offer either silicon bronze OR metric...

This thing has 6 screws, so a "speedseal" won't work. I'd love to replace it with a pump that would allow changing of the impeller from the front, vice back...