Mercedes-Benz OM352 Engine
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Mercedes-Benz Mercedes-Benz (), commonly referred to simply as Mercedes and occasionally as Benz, is a German automotive brand that was founded in 1926. Mercedes-Benz AG (a subsidiary of the Mercedes-Benz Group, established in 2019) is based in Stuttgart, ...
OM 352 is a 5.7 litre inline-6 cylinder 4-stroke
Diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...
, made by
Daimler-Benz Mercedes-Benz Group AG (formerly Daimler-Benz, DaimlerChrysler, and Daimler) is a Germany, German Multinational corporation, multinational Automotive industry, automotive company headquartered in Stuttgart, Baden-Württemberg, Germany. It is o ...
.


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 (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, 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, 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.) 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 with only four outlets. The
crankshaft A crankshaft is a mechanical component used in a reciprocating engine, piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating Shaft (mechanical engineering), shaft containing one or more crankpins, ...
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 reciprocating engine, piston engine which connects the piston to the crankshaft. Together with the crank (mechanism), crank, the connecting rod converts the reciprocating motion of the p ...
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 in 1979 for manufacture by Atlantis Diesel Engines (ADE) in
South Africa South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...
. 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
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