Engine block
Videos
In an internal combustion engine, the engine block is the structure that contains the cylinders and other components. The engine block in an early automotive engine consisted of just the cylinder bloc
Block of a modern V6 diesel engine with dry liners. The large holes are the cylinders, the small round orifices are mounting holes, and the small oval orifices adjacent to the cylinders are coolant or oil ducts.
Marine engine with cylinders cast in three pairs
Cylinders cast in two blocks of three
Cylinders cast in a single block of six, with an integrated crankcase (turbocharger in background)
Core plug
Videos
Core plugs, welch plugs, or freeze plugs are used to fill the sand casting core holes found on water-cooled internal combustion engines.
A core plug that has corroded from improper engine coolant maintenance, causing it to leak