The metal case enclosing the crankshaft and associated parts in a engine. Every generator whether diesel generator or standby power systems will have a crankcase. Crankcase are on engines with an alternator mounted on a frame with a fuel tank is called a generator as it generates useable electrical power. Used as emergency power and auxiliary power in the event of a power loss, installed as a permanent power protection system for business continuity. Fully automatic critical power systems which turn on if power if lost for true power continuity systems. They can be installed outside or inside a building as long as ventilation is provided and exhaust venting.