The

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 ...

OM 352 is a 5.7 litre

inline-6 The straight-six engine (also referred to as an inline-six engine; abbreviated I6 or L6) is a piston engine with six cylinders arranged in a straight line along the crankshaft. A straight-six engine has perfect primary and secondary engine balan ...

cylinder

4-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...

Diesel engine The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-call ...

, made by

Daimler-Benz The Mercedes-Benz Group Aktiengesellschaft, AG (previously named Daimler-Benz, DaimlerChrysler and Daimler) is a German Multinational corporation, multinational automotive corporation headquartered in Stuttgart, Baden-Württemberg, Germany. It ...

Development

It is one of many models in the 300 series of engines, which were developed during and after

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

, while specifically the OM352 was revealed in 1964. The OM352's lineage can be traced back to the OM311, itself an inline-six engine. The OM352 has many applications, including marine, military, municipal, and

agricultural vehicles A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery such as that used in agriculture, mining or construction. Most common ...

, as well as stationary settings. The engine has differing trim and power levels, affording designations such as OM 352A a variant fitted with a turbocharger, or the OM352 LA, which is fitted with an intercooler and a turbocharger. (

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 ...

.) The engine is water-cooled, and is produced using cast-iron cylinder block, with cast-in cylinders. The engine utilizes diesel fuel delivered in a direct injection method from a Bosch PES style inline injection pump. The cylinder head is a single unit for all cylinders, and the cylinder head cover and air intake are shared by a single cast aluminum alloy. Exhaust ports 2&3 and 4&5 are siamesed together, presenting an

exhaust manifold In automotive engineering, an exhaust manifold collects the exhaust gases from multiple cylinders into one pipe. The word ''manifold'' comes from the Old English word ''manigfeald'' (from the Anglo-Saxon ''manig'' anyand ''feald'' old and refe ...

with only four outlets. The

crankshaft A crankshaft is a mechanical component used in a piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating shaft containing one or more crankpins, that are driven by the pistons via the connecting ...

is a precision forged unit running in seven three-layer bearings, with counterweights bolted onto the crank webs, much like any other diesel motor of its vintage. The middle bearing is also the thrust bearing. The

connecting rod 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 cranksh ...

s are of a split design, with bronze bushings for the piston pin.

OM314

In 1965, a four-cylinder variant derived from the six cylinder OM352 was introduced, the OM314. Typical output for trucks was , later .

Licensed production

The OM352 was also one of many Mercedes engines

licensed A license (or licence) is an official permission or permit to do, use, or own something (as well as the document of that permission or permit). A license is granted by a party (licensor) to another party (licensee) as an element of an agreeme ...

in 1979 for manufacture by

Atlantis Diesel Engines Atlantis Diesel Engines/ Engineering (ADE) is a South African manufacturer of diesel engines and components, notably for the mining, on and off road applications as well as defense force industries. The company operates from Germiston, Gauteng, ...

(ADE) in

South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...

. These were known as ADE 352 and are virtually identical to the Mercedes engines. Recently the OM352 was licensed by TATA for use in their 713S Trucks. These are manufactured by TATA but however have slight differences like the weights no longer being bolted to but rather part of the crank and no holes for oil sprayers in the block. These modifications are likely to reduce complexity and cost of engine production. Common output power can vary from depending on the fuel delivery and air charge options. Higher output can be achieved through special modifications, however engine longevity may be affected with such non-factory modifications. Improved engines developed after the OM314 and OM352 include the OM364 (4 cyl.) and OM366 (6 cyl.), which look extremely similar in appearance and marked the final stage of development for the 300 series engines due to emissions requirements. Mercedes Benz 900 series engines are the successors of engines such as the OM300 series.

OM352 variants for the German market

Technical specifications

References

Bundesamt für Bevölkerungsschutz und Katastrophenhilfe:
Typenblatt Rüstwagen RW1
',

Unimog U 1300 L The Unimog (, ) is a range of multi-purpose tractors, trucks and lorries that has been produced by Boehringer from 1948 until 1951, and by Daimler Truck (formerly Daimler-Benz, DaimlerChrysler and Daimler AG) since 1951. In the United States and C ...

Bundesamt für Bevölkerungsschutz und Katastrophenhilfe:
Schlauchwagen SW 2000-Tr
', LAF 1113 B/36 Verband der Automobilindustrie:
Daimler-Benz AG. Typ L 1113 LK 1113
'' Gruppe 14, Dezember 1966. DK 629.113.5 Harald Maass: ''Gestaltung und Hauptabmessungen der Verbrennungskraftmaschine.'' In: Hans List (ed.): ''Die Verbrennungskraftmaschine – Neue Folge.'' Vol. 1, Springer, Wien/New York, 1979, , , p. 250. Carl-Heinz Vogler: ''Unimog 406 – Typengeschichte und Technik.'' Geramond, München 2016, . p. 61. Carl-Heinz Vogler: ''Unimog 406 – Typengeschichte und Technik.'' Geramond, München 2016, . p. 71. Carl-Heinz Vogler: ''Unimog 406 – Typengeschichte und Technik.'' Geramond, München 2016, . p. 76. Carl-Heinz Vogler: ''Unimog 406 – Typengeschichte und Technik.'' Geramond, München 2016, . p. 80. Carl-Heinz Vogler: ''Unimog 406 – Typengeschichte und Technik.'' Geramond, München 2016, . p. 102. Carl-Heinz Vogler: ''Unimog 406 – Typengeschichte und Technik.'' Geramond, München 2016, . p. 104. Carl-Heinz Vogler: ''Unimog 406 – Typengeschichte und Technik.'' Geramond, München 2016, . p. 106. Daimler AG (Hrsg.):
Dieselmotoren in Mercedes-Benz-Nutzfahrzeugen
'. Retrieved 4 February 2018. Daimler AG (Hrsg.):
Geburt einer Legende: Die 1949 vorgestellte Motorenbaureihe 300 ist ein großer Wurf
'. 22. April 2009. Retrieved 4 February 2018. ''Oldtimer-Traktor.'' Volume 11–12/2012. A. G. Daimler-Benz (Hrsg.): ''Unimog 435 Workshop manual'', Book 1 Section 1.2/1. {{DEFAULTSORT:Mercedes-Benz Om352 Engine OM352 Diesel engines by model Straight-six engines