Engineering:Mercedes-Benz OM621 engine
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| Mercedes-Benz OM621 | |
|---|---|
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 1956–1968 |
| Layout | |
| Configuration | Inline-four engine |
| Displacement |
|
| Cylinder bore | 85–87 mm (3.35–3.43 in) |
| Piston stroke | 83.6 mm (3.29 in) |
| Block material | Cast Iron |
| Head material | Cast Iron |
| Valvetrain | SOHC |
| Compression ratio | 18.0:1 |
| Combustion | |
| Fuel system | Indirect injection |
| Fuel type | Diesel |
| Cooling system | Water cooled |
| Output | |
| Power output | 35–40 kW (47–54 hp) |
| Torque output | 108–118 N⋅m (80–87 lb⋅ft) |
| Chronology | |
| Predecessor | Mercedes-Benz OM636 engine |
| Successor | Mercedes-Benz OM615 engine |
The OM621 is an inline-four diesel engine produced by Mercedes-Benz, from 1956 to 1968. It was succeeded by the OM615 engine.
Design
The OM621 is based on the petrol M121 engine, but features revised camshafts, cylinder head, pistons, and fuel injection system.[1] In 1961, the engine capacity was increased to 2.0 L (1,988 cc) and power was uprated to 55 PS (40 kW) for use in the newly introduced W110 models. After being replaced by the OM615, a 2.2 L (2,197 cc) updated version of the OM621 engine was used solely in Unimog vehicles until 1988.[2]
Models
| Engine | Displacement | Power | Torque | Years |
|---|---|---|---|---|
| OM621 I | 1.9 L (1,897 cc) | 37 kW (50 PS) at 4,000 rpm |
108 N⋅m (80 lb⋅ft) at 2,200 rpm |
1958–1959 |
| OM621 IV | 2.0 L (1,988 cc) | 35 kW (48 PS) at 3,800 rpm |
1961–1962 | |
| OM621 III / VIII | 40 kW (55 PS) at 4,200 rpm |
118 N⋅m (87 lb⋅ft) at 2,400 rpm |
1961–1968 | |
| 2.2 L (2,197 cc) | 40 kW (55 PS) at 3,000 rpm |
1966–1988 |
OM621 (37 kW version)
- 1958–1959 W121 190D, 190Db
OM621 (35 kW version)
- 1961–1962 W120 180Dc
OM621 (40 kW version)
- 1961–1965 W110 190Dc
- 1965–1968 W110 200D
- 1966–1988 Unimog 421
References
- ↑ Long, Brian (2014-01-31) (in en). Mercedes-Benz 'Fintail' Models: The W110, W111 and W112 Series. Crowood. ISBN 9781847976048. https://books.google.com/books?id=PoN8AwAAQBAJ&q=OM621.
- ↑ "1964-1993". https://www.mercedes-benz.co.uk/content/unitedkingdom/mpc/mpc_unitedkingdom_website/en/home_mpc/Unimog/home/unimog_world/unimog_history/1964-1993.html.
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