Mercedes-Benz OM352 engine

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Mercedes-Benz OM 352
OM 352.jpg
OM 352 cutaway model on static display at the Unimog Museum Gaggenau.
Overview
Manufacturer Daimler-Benz
Production1963-present
Layout
Configuration Inline-6
Displacement 5.675 L (346 cu in)
Cylinder bore 97 mm (3.82 in)
Piston stroke 128 mm (5.04 in)
Cylinder block material Cast iron
Cylinder head material Cast iron
Compression ratio 16:1
RPM range
Idle speed 700/min
Combustion
Operating principle Diesel
Turbocharger OM 352: none
OM 352 A: Turbocharger
OM 352 LA: Turbocharger and intercooler
Fuel systemHelix-controlled mechanical injection pump, direct injection
Fuel type Diesel fuel (DIN 51601)
Cooling system Water-cooled
Output
Power output 48–127 kW (65–173 PS; 64–170 hp)

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

Contents

Development

It is one of many models in the 300 series of engines, which were developed during and after World War II, while specifically the OM352 was revealed in 1964. The OM352's lineage can be traced back to the OM311, [1] itself an 80 PS (59 kW) inline-six engine. [2] 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 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 rods 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 59 kW (80 PS), later 63 kW (85 PS).

Licensed production

The OM352 was also one of many Mercedes engines licensed in 1979 for manufacture by Atlantis Diesel Engines (ADE) in South Africa. These were known as ADE 352 and are virtually identical to the Mercedes engines. Recently the OM352 was licensed by Tata Motors 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 92 to 141 kW (125 to 192 PS; 123 to 189 hp) 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 cylinders) and OM366 (6 cylinders), 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. [3]

OM352 variants for the German market

Variants for the German market
Rated power (DIN 70020)48 kW50 kW59 kW62 kW66 kW74 kW81 kW92 kW93 kW96 kW110 kW115 kW124 kW127 kW
Type designationOM 352.919OM 352.902OM 353.902OM 353.902OM 352.xxxOM 352.xxxOM 353.901OM 352.xxxOM 352.xxxOM 353.961OM 352.xxxOM 352.xxxOM 352.xxxOM 352.xxx
Turbochargernoyes
Year19641966196919711965196919691970196319xx196x1966197919xx
Source [4] [5] [6] [7] [8] [9] [10] [8] [11] [11] [12] [11] [13] [14] [11]

Technical specifications

Injection side of engine OM353.961.injectionside.jpg
Injection side of engine
Exhaust side of engine OM353.961.exhaustside.jpg
Exhaust side of engine
ModelOM 352OM 352OM 352 AOM 353OM 352 LA
Year19641966197519751979
Vehicle Unimog 406 (U 65)Mercedes-Benz L 322 (L 1113)Unimog 425 (U 1500) Unimog 435 (U 1300 L)Mercedes-Benz L 322 (LAF 1113)
Type designation352.919353.961
ConfigurationWater-cooled Straight-six
Operating principleDiesel
Valve systemOHV, two valves per cylinder
AspirationNaturalTurbochargedNaturalTurbocharged and intercooled
Oil systemWet sump
Fuel systemDirect injection
Bore × Stroke97 mm × 128 mm
Displacement5.675 L
Rated power (DIN 70020)48 kW (65 PS) at 2550/min93 kW (126 PS) at 2800/min110 kW (150 PS) at 2550/min96 kW (130 PS) at 2800/min124 kW (169 PS) at 2800/min
Max. torque (DIN 70020)353 N·m at 1600/min461 N·m at 1600/min363 N·m at 1700/min
Mean effective pressure784.5 kPa955 kPa
Mean piston speed11.95 m/s
Injection pressure19.6 MPa19.6 MPa
Compression ratio17 : 116 : 117 : 1
Mass410 kg460 kg460 kg
Firing order1–5–3–6–2–4
Sump capacity7–9 L
Cooling system capacity24 L
Alternator12 V, 0.24 kW
Source [4] [15] [16] [12] [17] [14] [18]

References

  1. ↑ "The birth of a legend: the 300 engine series, first unveiled in 1949, is a major advancement". marsMediaSite. Retrieved 2019-08-12.
  2. ↑ "The birth of a legend: The 300 engine series - first unveiled in 1949 - is a major advancement".
  3. ↑ "The birth of a legend: The 300 engine series - first unveiled in 1949 - is a major advancement".
  4. 1 2 Carl-Heinz Vogler: Unimog 406 – Typengeschichte und Technik. Geramond, München 2016, ISBN   978-3-86245-576-8. p. 61.
  5. ↑ Carl-Heinz Vogler: Unimog 406 – Typengeschichte und Technik. Geramond, München 2016, ISBN   978-3-86245-576-8. p. 71.
  6. ↑ Carl-Heinz Vogler: Unimog 406 – Typengeschichte und Technik. Geramond, München 2016, ISBN   978-3-86245-576-8. p. 76.
  7. ↑ Carl-Heinz Vogler: Unimog 406 – Typengeschichte und Technik. Geramond, München 2016, ISBN   978-3-86245-576-8. p. 80.
  8. 1 2 Carl-Heinz Vogler: Unimog 406 – Typengeschichte und Technik. Geramond, München 2016, ISBN   978-3-86245-576-8. p. 104.
  9. ↑ Carl-Heinz Vogler: Unimog 406 – Typengeschichte und Technik. Geramond, München 2016, ISBN   978-3-86245-576-8. p. 102.
  10. ↑ Carl-Heinz Vogler: Unimog 406 – Typengeschichte und Technik. Geramond, München 2016, ISBN   978-3-86245-576-8. p. 106.
  11. 1 2 3 4 Daimler AG: Geburt einer Legende: Die 1949 vorgestellte Motorenbaureihe 300 ist ein großer Wurf . 22 April 2009. Retrieved 4 February 2018.
  12. 1 2 A. G. Daimler-Benz (Hrsg.): Unimog 435 Workshop manual, Book 1 Section 1.2/1.
  13. ↑ Daimler AG: Dieselmotoren in Mercedes-Benz-Nutzfahrzeugen . Retrieved 4 February 2018.
  14. 1 2 Bundesamt für Bevölkerungsschutz und Katastrophenhilfe: Schlauchwagen SW 2000-Tr
  15. ↑ Verband der Automobilindustrie: Daimler-Benz AG. Typ L 1113 LK 1113 Archived 2018-02-08 at the Wayback Machine Gruppe 14, Dezember 1966. DK 629.113.5
  16. ↑ Oldtimer-Traktor. Volume 11–12/2012.
  17. ↑ Bundesamt für Bevölkerungsschutz und Katastrophenhilfe: Typenblatt Rüstwagen RW1 Archived 2018-02-01 at the Wayback Machine
  18. ↑ Maass, Harald (1979). "Gestaltung und Hauptabmessungen der Verbrennungskraftmaschine". In List, Hans (ed.). Die Verbrennungskraftmaschine – Neue Folge. Vol. 1. Wien/New York: Springer Verlag. p. 250. ISBN   3-211-81562-7.
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