DSK (디에스케이, formerly known as DAESAN Engineering) is a provider of diesel engine repair and maintenance services. It offers engine maintenance and troubleshooting, engine block and crankshaft replacement, surface grinding, crankshaft machining, as well as ship repair services. The company also manufactures piston crowns, steel structures, and deck machinery. DSK caters to engine makers, ship owners, and power plants related to diesel engines.