The Mercedes-Benz OM604 is a and inline-four cylinder (R4/I4)

double overhead camshaft An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combus ...

(DOHC)

diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...

with indirect injection manufactured by

Mercedes-Benz Mercedes-Benz (), commonly referred to simply as Mercedes and occasionally as Benz, is a German automotive brand that was founded in 1926. Mercedes-Benz AG (a subsidiary of the Mercedes-Benz Group, established in 2019) is based in Stuttgart, ...

between 1993 and 1998. It replaced the

single overhead camshaft An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combusti ...

(SOHC) OM601 engine. Unlike other Mercedes Benz diesels at the time that used a Bosch inline injection pump the OM604 used the

Lucas Lucas or LUCAS may refer to: People * Lucas (surname) * Lucas (given name) Arts and entertainment * Luca Family Singers, or the Lucas, a 19th-century African-American singing group * Lucas, a 1960s Swedish pop group formed by Janne Lucas Perss ...

electronically controlled rotary distributor injection pump (EVE) which is less reliable. The seals of the Lucas injection pumps become brittle over time and leak, a seal kit is available It is related to the

straight-5 The straight-five engine (also referred to as an inline-five engine; abbreviated I5 or L5) is a piston engine with five cylinders mounted in a straight line along the crankshaft. Although less common than straight-four engines and straight-six eng ...

2.5 litre OM605 and the

straight-6 A straight-six engine (also referred to as an inline-six engine; abbreviated I6 or L6) is a piston engine with six cylinders arranged in a straight line along the crankshaft. A straight-six engine has perfect primary and secondary engine balanc ...

3.0 litre OM606 engines.

Design

As per the OM601 the engine has a cast iron block and aluminum cylinder head. The block has 5 main caps, which are held by two bolts per cap. The head is a DOHC design with 4 valves per cylinder and split intake ports. Like the OM60, it has hydraulic bucket type lifters, thus requiring no periodical valve adjustment. It has a double row timing chain that drives the injection pump and the camshafts. The sprocket is on the exhaust camshaft and both cams are connected by a gear drive, while the oil pump is driven by a separate single row chain.

Specifications

SsangYong D20DT engine / OM664.95x

The Korean company Ssangyong has developed D20DT (created under license from Mercedes) series diesel engines based on the OM604 engine. Compared to the original Mercedes diesel, the Korean uses the Common Rail fuel injection system, turbocharging (unlike N/A OM604) and has slightly increased the engine capacity to 1,998 cc, compared to 1,997 cc in the OM604. In the Mercedes range, the engine has an index of OM664.950 / 951 and was installed on the Actyon, Actyon Sports and Kyron models in the mid-2000s.

References

{{Reflist OM604 Diesel engines by model Straight-four engines

Design

Specifications

SsangYong D20DT engine / OM664.95x

See also

References