Mercedes-Benz OM636

Mercedes-Benz OM636
Overview
Manufacturer Daimler-Benz AG
Production 1949–1990
Combustion chamber
Configuration I4
Displacement 1697–1767 cc
Cylinder bore 73,5 mm
Piston stroke 100 mm
Cylinder block alloy Cast iron
Cylinder head alloy Cast iron
Valvetrain OHV
Compression ratio 19 : 1
Combustion
Fuel system Precombustion chamber injection
Fuel type Diesel fuel
Oil system Wet sump
Cooling system Water-cooled
Output
Power output 28–32 kW
Torque output 96–101 N·m
Chronology
Predecessor OM 138
Successor OM 621

The Mercedes-Benz OM 636 is a diesel engine produced by Daimler-Benz. It was introduced in 1949. It is the successor of the OM 138. During its long production time, the OM 636 was first used as a passenger car engine in the Mercedes-Benz W 136 starting in 1949. Later, it was sold as an industrial engine and had many applications in vehicles such as light trucks, boats, and combine harvesters. It was succeeded by the OM 621. However, after the introduction of the OM 621, the OM 636 was kept in production until 1990.

The abbreviation OM means Oelmotor (oil engine), and stands for a Daimler-Benz engine that uses any kind of oil as fuel (diesel engine).

History

In 1949, the W 136 was offered with the OM 636 displacing 1,7 l producing 28 kW. For a short period of time between January 1952 and August 1953, a facelifted version of the W 136 (now having the chassis code W 191) was sold. It′s OM 636 was increased in power by 1 kW. In 1953, the W 120 succeeded the W 191, starting in 1954 it was offered with an upgraded version of the OM 636 now displacing 1,8 l and making 32 kW. After the introduction of the W 110 in 1961, the OM 636 was not used as a passenger car engine by Daimler-Benz anymore. The production in Germany was stopped in the early 1960s. In Spain, the production continued until 1990.

Technical description

The OM 636 is a water-cooled inline-four-cylinder diesel engine with precombustion chamber injection, OHV valvetrain and wet sump lubrication. Both the cylinder head and the cylinder block are made of grey cast iron. Both the crankshaft, which is supported in three bearings, and the connection rods are forged. The pistons are made of a light metal alloy. In the cylinder head, the OM 636 has two overhead valves per cylinder. The camshaft is driven by gears, it also drives the injection pump. The inlet and the precombustion chambers are on the left engine side, the outlet, camshaft and injection pump are placed on the right engine side.

Technical data

Application Engine code Bore × Stroke
(mm) 		Displacement
(cc) 		Compression ratio Rated power Torque Max. engine speed
170 D (W 136) OM 636 I 73,5 × 100 1697 19,0 : 1 28 kW @ 3200 rpm 96 Nm @ 2000 rpm
170 DS (W 191) OM 636 VI 75 × 100 1767 29 kW @ 3200 rpm 101 Nm @ 2000 rpm
180 D (W 120) OM 636 VII 32 kW @ 3500 rpm 98 Nm @ 1500 rpm 3600 rpm

See also

Bibliography

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