We saw the same thing in Cat C-12 engines. Pin separation due to crack in skirt area. Big bang and blown block. Cat was not nearly as good as DD at warranty / policy adjustments for this problem. They would cover some and deny more. If you had a high horsepower engine, it was likely to fail early in life. Ours were lower HP models and failed much later, but it was the same issue. We were less than impressed with the response.