In the early fall of 2014, I suffered a crankcase crack on the Lycoming IO360-A3B6D in my 1979 M20J. I have since replaced it with a factory rebuilt IO360-A3B6. The new engine is about 40 hours into the break-in, and all seems well.   Because I utilized information posted on Mooneyspace extensively throughout the process, I am capturing my lessons learned in this series of posts, as a resource to the community. I found that many important aspects of this job were not captured on Mooneyspace (o