I inherited a Yanmar 2GM
when I bought my boat. It didn't look great but I was able to get it running. Had to pull it because of another issue I was fixing (replacing fuel
tank) and decided I was going to do a few things to the engine
. As I took hoses and small pieces off, I realized the engine
was in need of a lot more work so I took it apart and did a bit of a rebuild
myself. $1200 in parts
and things are coming back together. The only way to describe its use by the past owners was Neglect. Engine only had around 730 hours and needed an overhaul
Issues I found were built up rust/carbon at the exhaust
mixer, carbon clogging the exhaust valves, crack in one piston (replaced both), oil
soaked air filter (previous valve cover gasket
failure I fixed), Lots of rust, cooling
passages blocked with salt/debris, replaced fuel/oil lines, replaced fuel pump
... Just all around mess. Seeing all that I found, I'm actually surprised it was still working.
Like I said, it's coming back together. I'm excited to see how it runs after the work I've been doing to it. Attached pictures show some of the problem areas.