I got hold of an engine last week, a Kubota D722 3 cylinder. I was told its pretty new but it has broken the crank right on the center main, between number 1 and 2 cylinder.
Do these engines have a reputation for breaking cranks?. I don't understand how the crank could break like this. If anywhere, i'd expect it after number 3 where the fly wheel attaches, surly this is where the most load is applied, not the front like where it broke. The only thing i could think was it could have been a bad casting that had an air pocket or hair line crack or something.
If it snorted up some water from a cracked head i'd expect it to bend the rod or smash the piston, but it seems straight and the piston is fine.
Ideas?
Are these prone to cracking heads like the V1702 are?
Do these engines have a reputation for breaking cranks?. I don't understand how the crank could break like this. If anywhere, i'd expect it after number 3 where the fly wheel attaches, surly this is where the most load is applied, not the front like where it broke. The only thing i could think was it could have been a bad casting that had an air pocket or hair line crack or something.
If it snorted up some water from a cracked head i'd expect it to bend the rod or smash the piston, but it seems straight and the piston is fine.
Ideas?
Are these prone to cracking heads like the V1702 are?