Dirty for fun,
I was always particular with my engine room. Easier to spot leaks if you keep them clean. I liked GM engines in general, from the 49 series to the big EMDS. Tow boats run full ahead when underway and the 2 stroke engines are best suited for that. You just can't run a four stroke flat out for 24/7 like they do on tow boats. My experience with four stroke engines run full ahead: Cummins V12s Fresh Water manifold used to leak like a sieve, so I had to throttle back, our Coast Guard cutters were powered with them. Not great when going out on a rescue. Cat engines used to rattle like they had a hand full of bearings in them. The Cats were the ones that used to grenade themselves for no reason. Marine Diesels have crankcase explosion doors on the bottom of the block, supposed to blow open when the bottom end ignited the oil mist in the crankcase from a hot bearing. The doors are spring loaded and will unload if ignition happens. It still makes one hell of a noise when they blow open. Working in an Engine Room isn't for everyone. You need a cast iron stomach if you work the West Coast especially in the winter. It's extremely loud, in excess of 120 decibles and it's hot. Just about every engine room I have worked in is about 135 ° fah so you have to have a pretty good tolerance for heat. I guess you could compare it to being under the hood of a car and you definitely learn what noises are normal and what are not. The worst boat I worked on would roll tied to the dock was the Ocean Master. She was built in Holland. Everything in the Engine Room was in Dutch including the engine telegraph. It had a Stork Workspoor 8 Cylinder engine. No valve covers, the top end was open and had to be oiled every couple of hours. Did I mention this was done on a cat walk.