Was a fairly common marine diesel in the late 70's and early 80"s. Bayliner did use quite a few of these.
Technically a Chrysler Mitsubishi CM-655TI and around 200HP. Also sometimes known as a Mitsubishi 6DS7.
Do a search using those terms and you will get plenty of hits including parts sources. Some parts are hard to come by, and the few suppliers that have them new are pretty proud of them.
These are pretty robust and reliable engines. But given that most of them in service are 40 years old.....