The Mercedes-Benz OM604 is a and
inline-four cylinder (R4/I4)
double overhead camshaft
An overhead camshaft (OHC) engine is a piston engine where 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 combustion cha ...
(DOHC)
diesel engine
The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-ca ...
with indirect injection manufactured by
Mercedes-Benz
Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquartere ...
between 1993 and 1998. It replaced the
single overhead camshaft
An overhead camshaft (OHC) engine is a piston engine where 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 combustion cha ...
(SOHC)
OM601 engine.
Unlike other Mercedes Benz diesels at the time that used a
Bosch inline injection pump the OM604 used the
Lucas 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 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, they are held by two bolts per cap. The head is a DOHC design with 4 valves x cylinder and split intake ports. As per the OM601 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.
See also
*
List of Mercedes-Benz engines
Mercedes-Benz has produced a range of petrol, diesel, and natural gas engines. This is a list of all internal combustion engine models manufactured.
Petrol engines Straight-three
* M160, 0.6 – 0.7 L (1998–2007)
* M281, 0.9 - 1.0 L (20 ...
References
{{Reflist
OM604
Diesel engines by model
Straight-four engines