Originally Posted by Brent Swain
A Canadian yacht had to be abandoned and the skipper rescued off the Great Barrier reef last year, when his Yanmar mounts all broke, and his loose engine bashed a hole in his hull. I have heard other stories about Yanmars breaking loose from all their mounts simultaneously, leaving the engine rolling dangerously in the bilge. They have nothing but rubber holding your engine in. You would be wiser to go for Perko mounts, which are not dependent on rubber alone for holding your engine in. If you have new Yanmar mounts, a bit of chain to stop your engine from breaking loose completely would be a good safety factor.
I agree that Yanmar mounts have no captive design against lateral (rolling) or uplift (capsize) forces. Fortunately the design does allow a quick and simple captive securing, i.e. with a chain.