In the mid 60's when I was a kid, I was plowing for an uncle with one of his two MF 85's. It started hammering & clattering, & just as I started to push in the clutch to figure it out, it just quit with a bang. I got off & looked at the engine, & it had a hole in the left side of the block. It lost a connecting rod. He & my dad spend the rest of the week putting a new Perkins in it.