Hey All, 1st timer here and I need some advice. I am having a clanging noise coming from the engine. Was on the interstate and heard a loud clanging, like something rattling around, then smoke poured from under the hood. When I looked, could not tell if it was water or oil. The truck still had power and still starts up but has that clanging noise. Before I look at getting a rebuilt engine, just trying to get some suggestions on other possibilities. By the way, when engine was examined, no sign of a rod through the block or the oil pan. Valve covers are in perfect shape. Someone told me that it could be a broken blade in the water pump flying around...is this possible or is there another suggestion? Thanks for any help you can give me.