The OM617 engine family is a
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 ...
diesel
Diesel may refer to:
* Diesel engine, an internal combustion engine where ignition is caused by compression
* Diesel fuel, a liquid fuel used in diesel engines
* Diesel locomotive, a railway locomotive in which the prime mover is a diesel engin ...
automobile engine from
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 ...
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 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
Vegetable oils, or vegetable fats, are oils extracted from seeds or from other parts of fruits. Like animal fats, vegetable fats are ''mixtures'' of triglycerides. Soybean oil, grape seed oil, and cocoa butter are examples of seed oils, or f ...
and
biodiesel
Biodiesel is a form of diesel fuel derived from plants or animals and consisting of long-chain fatty acid esters. It is typically made by chemically reacting lipids such as animal fat ( tallow), soybean oil, or some other vegetable oil ...
, although the use of these fuels may cause engine damage over time if not processed properly before use.
OM617 Naturally Aspirated
Essentially an OM616 with an extra cylinder, it debuted in 1974 with the W115(240 3.0d) chassis. Bore and stroke was . It was originally . Bosch MW inline
injection pump
An Injection Pump is the device that pumps fuel into the cylinders of a diesel engine. Traditionally, the injection pump was driven indirectly from the crankshaft by gears, chains or a toothed belt (often the timing belt) that also drives the ca ...
s were used, which had flyweight governors and vacuum shutoff. Previous engines had used pneumatic governors, and "gorilla knob" to start and shut off the engine. The North American engines had ADA device equipped pumps which limited fuel at high altitudes to prevent smoking with less dense air. New engine blocks after the .910 had rear mounted
oil filter
An oil filter is a filter designed to remove contaminants from engine oil, transmission oil, lubricating oil, or hydraulic oil. Their chief use is in internal-combustion engines for motor vehicles (both on- and off-road ), powered aircraft, r ...
housings, with a combined full flow and bypass filter element. In August 1978 the precombustion chamber was updated to be similar to the new OM617A design for more swirl and more efficient combustion. The engine capacity was lowered to to satisfy engine displacement tax laws in Europe by changing the bore to . September 1979 saw a new camshaft with greater valve lift let air and exhaust gases have less resistance. Power output rose to . Torque remained at @ 2400 rpm. In November 1980 the MW style injection pump was replaced with the M type for non-North American engines. Engines were equipped with
series wired loop type glow plugs up until 1980 when replaced by the much more reliable pencil type plugs (these had been already used in the OM617A since 1978). Vehicles sold to the North American market had
exhaust gas recirculation
In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide () emissions reduction technique used in petrol/gasoline, diesel engines and some hydrogen engines. EGR works by recirculating a portion of an engine's exhaust ...
equipment fitted.
OM617.910
Canister style oil filter at bottom front of engine. Power output was @ 4000 rpm and torque was @ 2400 rpm.
Applications:
* 1974-1976
240D 3.0 / 300D
OM617.912
This was introduced with the
W123 series. Power originally was @ 4000 rpm, torque @ 2400 rpm. From September 1979 - @ 4400 rpm, torque @ 2400 rpm.
Applications:
* 1977-1985
300D
* 1977-1981
300D North American
* 1977-1985
300D Long
* 1977-1981
300CD North American
* 1978-1985
300TD
OM617.913
This was an adaption of the .912 to the
T1 chassis. It had a downward facing oil filter housing.
* 1982–1988
209 D / 309 D / 409 D
OM617.931 and OM617.932
This engine was adapted from the .912 to fit the
G Class G class or Class G may refer to:
Locomotives
* NZR G class (1928), a type of steam locomotive used in New Zealand
* Tasmanian Government Railways G class, a class of 0-4-2T steam locomotive used in Australia
* V/Line G class, a class of diese ...
, main difference being oil pan changes.
Applications:
*1979-1991
W460/W461
OM617A Turbocharged
The year 1976 saw the engine adapted to use a
turbocharger
In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...
. This OM617LA was fitted to the C111-IID test vehicle, and set 16 world land speed and endurance records at the Nardo test facility in
Italy
Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...
. In 1978 the engine was upgraded again to and installed in the C111-IIID and broke 9 further records. Modifications for production engines included oil squirters to cool the underneath of the pistons; pistons with oil passages; stronger
connecting rods
A connecting rod, also called a 'con rod', is the part of a piston engine which connects the piston to the crankshaft. Together with the crank, the connecting rod converts the reciprocating motion of the piston into the rotation of the cranksha ...
; sodium filled valve stems and a stronger nitride-hardened crankshaft. Also an uprated oil pump with separate chain drive was fitted as the turbocharger lubrication required higher flow. Bosch MW injection pumps were calibrated for greater fuel output and fitted with an ALDA device which prevented overfueling until the turbocharger had begun to provide boost pressure. Pencil glow plugs were provided on all OM617A engines.
OM617.950
In 1978, the OM617.950 was mated with the
Mercedes-Benz W116
The Mercedes-Benz W116 is a series of flagship luxury sedans produced from September 1972 until 1980. The W116 automobiles were the first Mercedes-Benz models to be officially called S-Class, although earlier sedan models had already unofficiall ...
to produce the North American market-only 300SD, the world's first production
turbodiesel
The term turbo-diesel, also written as turbodiesel and turbo diesel, refers to any diesel engine equipped with a turbocharger. As with other engine types, turbocharging a diesel engine can significantly increase its efficiency and power output ...
sedan. These engines pre-dated the introduction of tighter emissions laws, so were not fitted with EGR. Power originally was @ 4200 rpm, torque @ 2400 rpm. From October 1979 - @ 4350 rpm, torque @ 2400 rpm.
Applications:
* 1978-1980
300SD Turbo
OM617.951
The .951 was introduced for 1981 and displaced , using a bore and stroke. Power originally was @ 4350 rpm, torque @ 2400 rpm. From August 1984 - @ 4350 rpm, torque @ 2400 rpm. Vehicles sold to the North American market had EGR equipment fitted.
Applications:
* 1981-1985
300SD Turbo
* 1981
300TD Turbo
OM617.952
The .952 is identical to the .951 apart from minor changes to fit the North American 123 chassis. It was also fitted to the European market W123 wagon, the 300TD. This was the only turbocharged OM617 fitted to a European W123. Power originally was @ 4350 rpm, torque @ 2400 rpm. From October 1982 - @ 4350 rpm, torque @ 2400 rpm. Vehicles sold to the North American market had EGR equipment fitted.
Applications:
* 1981-1985
300D Turbo North American
* 1981-1985
300CD Turbo North American
* 1982-1985
300TD Turbo
* Military
Hagglund Bv206 Bandvagn
OM617 by AMG
While many people believe the 2001-2004
Mercedes-Benz C 30 CDI AMG was the first and so far only diesel model built in
Affalterbach
Affalterbach is a municipality in the Ludwigsburg district in Baden-Württemberg, Germany.
History
Affalterbach became a possession of the County of Württemberg in 1322 and was placed under the jurisdiction of Marbach am Neckar. As it sat on ...
, the 1989
AMG MB 100 D begs to differ. Just two years after the infamous Hammer hit the scene,
AMG turned its attention towards Benz's Spanish-made workhorse.
AMG offered an upgraded diesel both in 2.4-
(OM616) or 3.0-liter form (OM617), tuned to give the light van 98 or 127 horsepower, mostly thanks to a new sequential turbocharger. The extra kraft came in handy, considering the weight penalty of rich leathers and television sets.
Applications:
* 1989
MB100 D AMG 3.0
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
{{DEFAULTSORT:Mercedes-Benz Om617 Engine
OM617
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 ...
Diesel engines by model
Straight-five engines