Mercedes-Benz OM605 engine

The Mercedes-Benz OM605 is a 2.5 L (2,497 cc) inline-five cylinder (R5/I5) double overhead camshaft (DOHC) diesel engine with indirect injection manufactured by Mercedes-Benz between 1993 and 2001. It replaced the single overhead camshaft (SOHC) OM602 engine.

Mercedes-Benz OM605
Overview
ManufacturerMercedes-Benz
ProductionJuly 1993 (1993-07)–2001 (2001)
Layout
ConfigurationStraight-5
Displacement2.5 L (2,497 cc)
Cylinder bore87 mm (3.43 in)
Piston stroke84 mm (3.31 in)
Cylinder block materialCast iron
Cylinder head materialAluminum
ValvetrainDOHC / 4 valves x cyl.
Valvetrain drive systemChain
Compression ratio22.0:1
RPM range
Idle speed650-750 (.911)
580-680 (ERE)
Max. engine speed5200 RPM
Combustion
TurbochargerNo (.91x)
Yes, intercooled (.96x)
Fuel systemBosch in-line indirect injection M-type
ManagementRSF Governed (.911)
Bosch EDC (ERE)
Fuel typeDiesel
Oil systemWet sump
Cooling systemWater-cooled
Output
Power output83–110 kW (113–150 PS; 111–148 hp)
Torque output170–280 N⋅m (125–207 lb⋅ft)
Emissions
Emissions control systemsCatalytic converter
Exhaust gas recirculation
Chronology
PredecessorMercedes-Benz OM602 engine
SuccessorMercedes-Benz OM612 engine

It uses a Bosch electronically controlled inline injection pump (ERE) except in the W124 where it uses a Bosch mechanically governed inline injection pump (Bosch M pump with RSF governor).

It is related to the straight-4 2.0 and 2.2 litre OM604 and the straight-6 3.0 litre OM606 engines.

Design

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As per the OM602 the engine has a cast iron block and aluminum cylinder head, the block has 6 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 OM602 it has hydraulic bucket type lifters, thus requiring no periodical valve adjustment. A big difference when compared to its turbo predecessors is the intercooler

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

The main differences between the naturally aspirated and the turbocharged versions are the cylinder head, injection pump, valves, camshafts, rods, intake and exhaust manifolds and some minor differences like oil feed and return holes for the turbo and different crankcase ventilation system, valve cover and plastic engine cover

Specifications

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ID DIN-rated max. motive power
at rpm
max. torque
at rpm
aspiration years applications
OM 605.910 ERE 83 kW (113 PS; 111 hp) @5000 rpm 170 N⋅m (125 lb⋅ft) @2800 rpm Natural 1993–1995 W202 C 250 D
OM 605.911 83 kW (113 PS; 111 hp) @5000 rpm 170 N⋅m (125 lb⋅ft) @2800 rpm Natural 1993–1996 W124 E 250 D
OM 605.912 ERE 83 kW (113 PS; 111 hp) @5000 rpm 170 N⋅m (125 lb⋅ft) @2800 rpm Natural 1996–1998 W210 E 250 D
OM 605.960 ERE 110 kW (150 PS; 148 hp) @4400 rpm 280 N⋅m (207 lb⋅ft) @1800 rpm Turbocharger, intercooler 1995–2001 W202 C 250 Turbodiesel
OM 605.962 ERE 110 kW (150 PS; 148 hp) @4400 rpm 280 N⋅m (207 lb⋅ft) @1800 rpm Turbocharger, intercooler 1997–1998 W210 E 250 Turbodiesel

See also

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