If there's no system to shut down the engine on overheating of coolant or oil, you're definitely looking at a fire hazard. The bigger issue is the terrible eff

If there's no system to shut down the engine on overheating of coolant or oil, you're definitely looking at a fire hazard. The bigger issue is the terrible efficiency; alternators are about 50% efficient, whereas proper mechanical generators are 90%+. The better solution would be to buy a "generator head" and connect it to the engine...but by the time you get done making a frame to hold the generator, engine, fuel tank, radiator, expansion tank, etc - as well as the necessary safety systems - you might as well just have bought an used generator.