Mercedes-Benz OM621 engine

Last updated
Mercedes-Benz OM621
Overview
Manufacturer Mercedes-Benz
Production1956–1968
Layout
Configuration Inline-four engine
Displacement
  • 1.9 L (1,897 cc)
  • 2.0 L (1,988 cc)
  • 2.2 L (2,197 cc)
Cylinder bore 85–87 mm (3.35–3.43 in)
Piston stroke 83.6 mm (3.29 in)
Block material Cast Iron
Head materialCast Iron
Valvetrain SOHC
Compression ratio 18.0:1
Combustion
Fuel system Indirect injection
Fuel type Diesel
Cooling system Water cooled
Output
Power output 35–40 kW (47–54 hp)
Torque output 108–118 N⋅m (80–87 lb⋅ft)
Chronology
Predecessor Mercedes-Benz OM636 engine
Successor Mercedes-Benz OM615 engine

The OM621 is an inline-four diesel engine produced by Mercedes-Benz, from 1956 to 1968. It was succeeded by the OM615 engine.

Contents

Design

The OM621 is based on the petrol M121 engine, but features revised camshafts, cylinder head, pistons, and fuel injection system. [1] In 1961, the engine capacity was increased to 2.0 L (1,988 cc) and power was uprated to 55 PS (40 kW) for use in the newly introduced W110 models. After being replaced by the OM615, a 2.2 L (2,197 cc) updated version of the OM621 engine was used solely in Unimog vehicles until 1988. [2]

Models

EngineDisplacementPowerTorqueYears
OM621 I1.9 L (1,897 cc)37 kW (50 PS)
at 4,000 rpm
108 N⋅m (80 lb⋅ft)
at 2,200 rpm
1958–1959
OM621 IV2.0 L (1,988 cc)35 kW (48 PS)
at 3,800 rpm
1961–1962
OM621 III / VIII40 kW (55 PS)
at 4,200 rpm
118 N⋅m (87 lb⋅ft)
at 2,400 rpm
1961–1968
2.2 L (2,197 cc)40 kW (55 PS)
at 3,000 rpm
1966–1988

OM621 (37 kW version)

OM621 (35 kW version)

OM621 (40 kW version)

Related Research Articles

Unimog

The Unimog is a range of multi-purpose all-wheel drive medium trucks produced by Daimler AG and sold under the Mercedes-Benz brand. In the United States and Canada, the Unimog was sold as the Freightliner Unimog.

Mercedes-Benz W201 Motor vehicle

The Mercedes-Benz W201 was the internal designation for the Mercedes 190 series sedans, a range of front-engine, rear drive, five passenger, four-door sedans manufactured over a single generation, from 1982 to 1993 as the company's first compact class automobile.

Mercedes-Benz W120/W121 Motor vehicle

The Mercedes-Benz W 120 and Mercedes-Benz W 121 are technically similar inline-four cylinder sedans made by Daimler-Benz. The W 120 was first introduced by Mercedes-Benz in 1953. Powered initially by the company's existing 1.8 liter M 136 engine, it was sold as the Mercedes-Benz 180 through 1962. From 1954, Mercedes-Benz also offered the W 120 with a diesel engine as the Mercedes-Benz 180 D. The Mercedes-Benz W 121 was introduced as the Mercedes-Benz 190 in 1956, powered by a 1.9 liter M 121 engine. From 1958, the W 121 was also offered with an OM 621 engine, sold as the Mercedes-Benz 190 D through 1961.

Mercedes-Benz W110 Motor vehicle

The W110/Eksi-Eksi was Mercedes-Benz's entry level line of midsize automobiles in the mid-1960s. One of Mercedes' range of "Fintail" models, the W110 initially was available with either a 1.9 L M121 gasoline or 2.0 L OM621 diesel inline-four. It was introduced with the 190c and 190Dc sedans in April 1961, replacing the W120 180c/180Dc and W121 190b/190Db.

Mercedes-Benz W114/W115 Motor vehicle

The Mercedes-Benz W114 and W115 were the internal designation Mercedes-Benz used for a generation of front-engine, rear-drive, five-passenger sedans and coupés introduced in 1968, with three-box styling by Paul Bracq — succeeding the W110 Fintail models introduced in 1961; and manufactured until model year 1976, when the W123 was released.

Mercedes-Benz has sold a number of automobiles with the "190" model name:

Mercedes-Benz OM615 engine Motor vehicle engine

The OM615 was a four-cylinder diesel engine made by Mercedes-Benz. A successor to the OM621, it was sold in early 1968 in two versions: 1,988 cc (2.0 L) and 2,197 cc (2.2 L) engine.

Mercedes-Benz OM616 engine Motor vehicle engine

The OM616 engine family is a diesel automobile Inline-four engine from Mercedes-Benz used in the 1970s and 1980s, and produced by Force Motors in India from the 1980s to the present.

Mercedes-Benz OM617 engine Motor vehicle engine

The OM617 engine family is a straight-5 diesel automobile engine from Mercedes-Benz used in the 1970s and 1980s. It is a direct development from the straight-4 OM616. It was sold in vehicles from 1974 to 1991. The OM617 is considered to be one of the most reliable engines ever produced with engines often reaching over 1,000,000 km (620,000 mi) without being rebuilt and is one of the key reasons for Mercedes' popularity in North America in the 1980s, as it was powerful and reliable compared to other automotive diesels of the time. It is also a very popular choice for the use of alternative fuels, mainly straight or waste vegetable oil and biodiesel, although the use of these fuels may cause engine damage over time if not processed properly before use.

Mercedes-Benz W108/W109 Motor vehicle

The Mercedes-Benz W108 and W109 are luxury cars produced by Mercedes-Benz from 1965 through to 1972 and 1973 in North America only. The line was an update of the predecessor W111 and W112 fintail sedans. The cars were successful in West Germany and in export markets including North America and Southeast Asia. During the seven-year run, a total of 383,361 units were manufactured.

Mercedes-Benz Ponton Motor vehicle

The Mercedes-Benz "Ponton" series are a range of sedans / saloon car models from Daimler-Benz, introduced starting in 1953, and subsequently nicknamed 'Ponton', referring to its ponton styling, a prominent styling trend that unified the previously articulated hood, body, fenders and runnings boards into a singular, often slab-sided envelope. At the time, Mercedes itself did not refer to any of its cars using the nickname.

Mercedes-Benz W112 Car model

The Mercedes-Benz W112 is a luxury automobile produced by Mercedes-Benz from 1961 to 1967. Marketed as the 300SE, it was available as a coupé, convertible, sedan, and stretched sedan (Lang), all generally similar in appearance to the corresponding Mercedes-Benz W111.

Mercedes-Benz OM352 engine Motor vehicle engine

The Mercedes-Benz OM 352 is a 5.7 litre inline-6 cylinder 4-stroke Diesel engine, made by Daimler-Benz.

Mercedes-Benz M180 engine Motor vehicle engine

The Mercedes Benz M180 Engine was a 2.2 L; 134.0 cu in (2,196 cc) single overhead camshaft inline-6 cylinder engine introduced at the Frankfurt Motor Show in April 1951 to power the company's new 220 (W187). It was the first engine with a cylinder bore greater than its stroke that Mercedes had installed in a production car, while using a reverse-flow cylinder head.

Mercedes-Benz OM601 engine Motor vehicle engine

The Mercedes-Benz OM601 engine is a 4 cylinder diesel automobile engine that was manufactured by Mercedes-Benz.

Mercedes-Benz M121 engine Motor vehicle engine

The Mercedes-Benz M121 engine was a 1.9 liter single overhead camshaft inline four-cylinder engine introduced by Mercedes in 1955 and used in various model lines during the 1950s and 1960s. Originally rated at 56 kW at 5500 rpm, it replaced the 1.8 liter M136 introduced in 1935, offering improved performance over the M136's side camshaft design.

Mercedes-Benz OM636 engine Motor vehicle engine

The Mercedes-Benz OM 636 is a diesel engine that has been produced by Daimler-Benz from 1948 until 1990. Being the successor to the OM 138, the OM 636 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 W 136. Throughout the 1950s, the OM 636 was widely used in the Mercedes-Benz W 120. In 1958, it was succeeded by the OM 621 passenger car engine. However, after the introduction of the OM 621, the OM 636 was kept in production for industrial vehicles such as small lorries, boats, and combine harvesters, until 1990.

Unimog 404 Motor vehicle

The Unimog 404, also called the Unimog S and Unimog 404 S, is a vehicle of the Unimog-series by Mercedes-Benz, produced in the Unimog plant in Gaggenau from 1955 to 1980. Marketed as Unimog U82, and later Unimog U110, 64,242 units of the two Unimog 404 types 404.0 and 404.1 were built, which makes the 404 the Unimog model with the highest production figure of all Unimogs. Unlike the Unimog 401, the 404 is rather a small 1.5-tonne-offroad-truck than an agricultural vehicle. In Germany, it was a common military vehicle and fire engine, 36,000 Unimog 404 were made for the Bundeswehr.

Unimog 406 Motor vehicle

The Unimog 406 is a vehicle of the Unimog-series by Mercedes-Benz. A total of 37,069 units were manufactured by the Daimler-Benz AG in the Unimog plant in Gaggenau from 1963 to 1989. The 406 was the first medium duty Unimog, having a larger wheelbase of 2380 mm and more than twice the engine power of the Unimog 401. Unlike the initial Unimog, the 406 does not have a car engine but a heavy duty truck engine instead. Several following Unimog versions were based on the 406. There were eleven different types made of the Unimog 406, which were available in four models with a closed two-door or four-door cab, as Cabrio and as an OEM part. During its long production period, the 406 received several technical refinements. In 1964, the precombustion chamber diesel engine OM 312 was replaced with the direct injected OM 352. Disc brakes followed in 1973. For many enthusiasts, the Unimog 406 represents the classical Unimog, having agricultural and silvicultural applications. It was successful and the best embodiment of the word Universal-Motor-Gerät considering all prior Unimogs.

Unimog 425 Motor vehicle

The Unimog 425 is the first series production heavy duty Unimog series, made by Daimler-Benz from 1975 to 1988 in the Mercedes-Benz Gaggenau plant, alongside the long-wheelbase model Unimog 435. It was first presented to the public on the 1974 DLG show in Frankfurt, then named Unimog U 120, indicating a power output of 120 PS. However, series production models were equipped with 125 PS or 150 PS engines, and therefore called U 1300 and U 1500. Daimler-Benz made three types of the Unimog 425, and a total number of 3135 were built, making the 425 much rarer compared to the longer wheelbase, but otherwise similar Unimog 435, of which more than 30,000 were built. The 425 was the first Unimog to feature the "edgy cab", which is still used in the Unimog today.

References

  1. Long, Brian (2014-01-31). Mercedes-Benz 'Fintail' Models: The W110, W111 and W112 Series. Crowood. ISBN   9781847976048.
  2. "1964-1993". www.mercedes-benz.co.uk. Retrieved 2018-07-22.