Complete Used Engines Shipped Worldwide Used engines are sold by the container load from the USA, Canada or the UK in either 'as is' condition or 'core' units for rebuilding.. 'As is' condition means that the engine is complete from flywheel to fan, no visible defects and will turn 360 degrees.   Caterpillar 3306 PC Power Unit 'Core units are 'as is' condition engines which have been inspected. The oil pan is removed to inspect and report on the condition of the crankshaft. Major units may be guaranteed by agreement and at extra cost. Whatever power unit or engine you are searching for, we can source it.