Originally Posted by donradclife
Another sure-fire way to make mechanics rich is to have a leak in your fresh water cooling system, let the engine boil over, then shut it down and add cold water. If it doesn't crack the block it will at least warp the head.
Actually, cold water in a hot engine gets steamed off. The water becomes steam and forces the engine to hyper contract which causes cracks. Diesels are not as prone to cracking as gas engine due the heavy construction of the components. They will survive it, i have seen it happen more times than a failure. The best thing to do is allow it to cool then run water slowly and check for damage. Engine with liners are the most prone to damage as the high heat crystallizes the o rings that seal the liners. Then water just fill's the crank case.