Mercedes OM312 Diesel Engine Manuals
Mercedes-Benz OM312 is a 4.6 liter straight 6-cylinder diesel engine with a 4578cm displacement producing 100hp @ 3000 rpm (312.915 version produced 1949 - 1956) and 115hp @ 2800 rpm (312A Turbo version produced 1953 - 1956 )
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Download: Mercedes OM312 Engine Operation and Maintenance Manual
Operating
Instructions and Maintenance
OM312 Diesel Engines
OM312A Turbo Diesel Engines
Download: 28.9mb, 36 pages, .pdf
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herunterladen: Mercedes OM312 Motor Betriebs und Wartungshandbuch
Deutsch
OM312 Diesel Betrieb und Instandhaltung
Anwendungen: OM312 OM321 OM322 OM326
herunterladen: 24.2mb, 49 Seiten, .pdf
Language: German Betriebsanleitung
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OM312 Technical Data
The Mercedes-Benz OM 312 was the first diesel engine developed after
World War II and formed the basis for many of the engines to follow
in the 300 series.
Much of the OM312 motor design comes from experience gained with the
production of engines for Opel during the Second World War. The engine
is equipped with a pre-chamber, and achieves an average working pressure
of 7.4 Kg/cm2. Features include: Mahle pistons equipped with 4 compression
rings and two scraper rings, with one of the rings being chromed.
Typical Specifications
| OM312 Diesel 15 June 1949 - 1956 (OM 312 A 1953 - 1956) | ||
|---|---|---|
| Engine | ABOUT 312 | ABOUT 312 A |
| Variant | 312,915 | 312. |
| Execution | Suction motor | Turbo |
| Weight dry | 362 Kg | 375 Kg |
| L x W x H | 927mm x 660mm x 1048mm | |
| Year of construction | 1949 - 1956 | 1953 - 1956 |
| Performance | 100 Hp @ 3000 rpm | 115 HP @ 2800 rpm |
| Liter performance | 21.83 HP per litre | |
| Torque | 277 Nm @ 1600 rpm | |
| Injection | Anterior chamber | |
| Cylinders | R6 | |
| Stroke volume | 4578 cm³ | |
| Drilling | 90 mm | |
| Punch | 120 mm | |
| Compression | 19.8:1 | |
| Piston | Mahle | Mahle |
| Turbo | No | Yes |
| Valve system | Push rod - 1 in 1 out - hanging valves | |
| Cooling | Water | |
| Intake opens | 29° 30' before ENE | |
| Intake bars | 55° 90´ after UT | |
| Exhaust opens | 57° 40´ our UT | |
| Exhaust bars | 24° 30´ nach OT | |
| Clearance intake | 0.20 mm - cold engine | |
| Clearance exhaust | 0.25 mm - cold engine | |
| Ignition sequence | 1-5-3-6-2-4 | |
| Diesel pump | Bosch PES 6 A 70 B 410 RS 64/7 | |
| Nozzle tip | Bosch DNO SD 211 (135 Bar) | |
| Oil type | HD 5W 30 | |
| Crankshaft | Forged, 7 bearing bearings | |
| Tightening torques | ||
| Top bolt and nut | 11 mg | |
| Frame stock | 12 mg | |
| Council stock | 15 mg | |
| Flywheel | 10 mg | |
| Vibration damper | 50 mg | |
| Anterior chamber | 32 mg | |
| Nozzle nut | 8 mg | |
| Nozzle in antechamber | 8.5 mg | |
| Nozzle pipe | 2.5 mg | |
| Glow plug | 5 mg | |
Survey of Versions
Engine type: OM312 - OM312.900, OM312.915 - Diesel
- Engine type: OM312
- Construction Year: 1949-1965
- Number of cylinders: 6
- Bore ø: 90 mm
- Engine content: 4580 CC
- Compression ratio: 19,8 : 1
- HP: 90 - 100
Vehicle Applications
- Mercedes Trucks - Types: L311 L312 L323 L328
- Farm Equipment
- Industrial - Bus - Boat - Marine
Supplements and Resources
- OM312 Marine pdf
- OM312 Tech Data Brochure pdf
OM312 Engine Parts Diagram
