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Mercedes-Benz OM636 engine

FieldValue
imageMercedes-Benz OM 636 JM 2023 08 12 5D410544.jpg
manufacturerDaimler-Benz AG
configurationInline 4
production
bore73.5 mm
75 mm
stroke100 mm
displacement1697 cc
1767 cc
blockCast iron
headCast iron
valvetrainOHV
fuelsystemPrecombustion chamber injection
operating principleDiesel
fueltypeGasoil
oilsystemWet sump
coolingsystemWater-cooled
power28–32 kW
torque96–101 Nm
compression19.0:1
redline3600
predecessorOM 138
successorOM 621

75 mm 1767 cc

The Mercedes-Benz OM636 is a diesel engine that was produced by Daimler-Benz from 1948 until 1990. Being the successor to the OM138, the OM636 has been used both as a passenger car engine and as an industrial engine. It saw its first use in the Boehringer Unimog in 1948, prior to its official introduction in the 1949 Mercedes-Benz W136. Throughout the 1950s, the OM636 was widely used in the Mercedes-Benz W120. In 1958, it was succeeded by the OM621 passenger car engine. However, after the introduction of the OM621, the OM636 was kept in production for industrial vehicles such as small lorries, boats, and combine harvesters, until 1990.

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

History

Daimler-Benz began developing the OM636 during World War II, and had completed the developing process by 1948. According to Carl-Heinz-Vogler, a former Daimler-Benz engineer, the OM636 was ready for series production in 1948. The pre-series production units made that year were used in the 1948 Boehringer Unimog.

In 1949, the W136 was offered with the OM636, displacing 1.7 litres and producing 38 PS. For a short period of time between January 1952 and August 1953, a facelifted version of the W136 (now having the chassis code W191) was sold. Its OM 636 was increased in power by 2 PS. In 1953, the W120 succeeded the W191, starting in 1954 it was offered with an upgraded version of the OM636, now displacing 1.8 litres and again making 40 PS. After the introduction of the W110 in 1961, the OM636 was no longer used as a passenger car engine by Daimler-Benz. Production in Germany was stopped in the early 1960s, while continuing until 1990 in Spain.

In 1969, the spanish automotive manufacturer SEAT presented the SEAT 1800 D, a version of the SEAT 1500 equipped with Mercedes-Benz OM636 diesel engine. The version used was the OM636.954, built in Barcelona under license, displacing 1767 cc and producing 46 PS at 3,600 rpm.

Technical description

The OM636 is a water-cooled inline-four-cylinder diesel engine with precombustion chamber injection, eight valves, OHV valvetrain and wet sump lubrication. It has a cross-flow cylinder head made of grey cast iron. The cylinder block material is also 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. The camshaft is driven by gears, it also drives the inline injection pump. The camshaft and injection pump are placed on the engine's exhaust side.

Technical data

Engine codeEngine nameBore × StrokeDisplacementCompression ratioRated power (DIN 70020)Torque (DIN 70020)Source
OM636.915
OM636.912
OM636.916
OM636.931
OM636.930
43 PS at 3500 rpm
OM636.914
32 PS at 2550 rpm
34 PS at 2750 rpm
25 PS at 2300 rpm
OM636.954

OM 636.912 Unimog 70.200 / 2010 OM 636.914 Unimog 2010, 401, 402, 411 OM 636.915 Mercedes W 136 OM 636.916 Mercedes W 136 OM 636.917 OM 636.918 OM 636.919 Mercedes L 319 OM 636.930 Mercedes W 136 OM 636.931 Mercedes W 120 OM 636.937 OM 636.938 OM 636.940 OM 636.948 OM 636.949 OM 636.950 OM 636.951 OM 636.952 OM 636.954 - SEAT 1800 Diesel, license-built in Barcelona by Empresa Nacional de Motores de Aviación OM 636.955 OM 636.956 OM 636.957

References

Bibliography

  • Der 1,8-l-Dieselmotor des Mercedes-Benz 170 Da in: Kraftfahrzeugtechnik 7/1952, p.211-213

References

  1. Vogler, Carl-Heinz. (2014). "Unimog 411: Typengeschichte und Technik". GeraMond.
  2. Sánchez, Miguel. (17 April 2023). "SEAT 1800 D, un diésel con motor Mercedes".
  3. Daimler AG (ed.): ''[https://mercedes-benz-publicarchive.com/marsClassic/de/instance/ko/170-D--W-136-I-D-1949---1950.xhtml?oid=5211 170 D]'', in Mercedes-Benz Public Archive, retrieved 8 January 2021
  4. [[#CHV14. Vogler 2014]], p. 49
  5. Daimler AG (ed.): ''[https://mercedes-benz-publicarchive.com/marsClassic/de/instance/ko/170-Db--W-136-VI-D-1952---1953.xhtml?oid=5215 170 Db]'', in Mercedes-Benz Public Archive, retrieved 8 January 2021
  6. Daimler AG (ed.): ''[https://mercedes-benz-publicarchive.com/marsClassic/instance/ko/ko.xhtml?oid=5073 170 S-D]'', in Mercedes-Benz Public Archive, retrieved 8 January 2021
  7. Daimler AG (ed.): ''[https://mercedes-benz-publicarchive.com/marsClassic/instance/ko/ko.xhtml?oid=5137 180 D]'', in Mercedes-Benz Public Archive, retrieved 8 January 2021
  8. (1969). "SEAT 1800 Diesel". Compañía Hispano Alemana de Productos Mercedes-Benz S. A..
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