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; 50 hp)
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; 47 hp)
at 3,800 rpm 		1961–1962
OM621 III / VIII 40 kW; 54 hp (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; 54 hp (55 PS)
at 3,000 rpm 		1966–1988

OM621 (37 kW version)

37 kW (50 PS; 50 hp)

OM621 (35 kW version)

35 kW (48 PS; 47 hp)

OM621 (40 kW version)

40 kW (54 PS; 54 hp)

References

  1. ^ Long, Brian (2014-01-31). Mercedes-Benz 'Fintail' Models: The W110, W111 and W112 Series. Crowood. ISBN 9781847976048.
  2. ^ "1964-1993". www.mercedes-benz.co.uk. Retrieved 2018-07-22.
Allikas: https://en.wikipedia.org/wiki/Mercedes-Benz_OM621_engine
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