diesel maintenance

I recently bought a 1980 ericson 38 with the original Universal 5432 diesel with 4k hours, and I'm trying to decide if it has an overheating problem or not. The previous owners said the engine temperature gauge should be at 160f, but when I motor around it climbs up to 180-185 at 1800-2000 rpms...

Hello Ericson community, The diesel engine (Universal M40) of our Ericson 38 exhausts white smoke when running. The issue has been here since we purchased the boat around a year ago but I would said it has become worst over the past months. I have read white smoke is associated with low heat...