Mercedes-Benz OM604 engine

The Mercedes-Benz OM604 is an inline-four diesel engine of 2.0 litres (1,997 cc) and 2.2 litres (2,155 cc), built by Mercedes-Benz between 1993 and 1998 as the double overhead camshaft replacement for the single overhead camshaft OM601. It uses indirect injection and a Lucas electronically controlled rotary distributor pump, which is described as less reliable than the Bosch inline pumps of other Mercedes diesels because its seals harden and leak over time. The cast iron block carries five main caps and an aluminum head with four valves per cylinder and hydraulic bucket lifters, and a double-row chain drives the camshafts. It is related to the OM605 five-cylinder and the OM606 six-cylinder. Ssangyong later developed its D20DT diesel from this design under licence.