Mercedes M114 Petrol Engine Manuals

The Mercedes-Benz M114 6-Cylinder Petrol Engine came in two 2.5 liter variants - including: M114.920 (M114 V25) and M114.980 (M114 E25), with production from 1967-1972

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Mercedes M114 Engine Manual
Multi Unit Manual: M114, M115, M130, M180
M114 Applications: W114 250, 250C, 250CE
Versions: 114.920, 114.923, 114.980, 114.981
Download: 76.6mb, 403 pages, .pdf

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M114 Engine Technical Data

The M114s engine The M114 was a 2.5-liter six cylinder gasoline motor that was available both as a carburetor version, or with fuel injection. These versions were derived from the M108 and M129 engines respectively, from which they retain almost all the main features.

The two versions of the M114 engine are described below

M114V25 / M114.920

These two abbreviations indicate the M114 carburetor powered engine. This version was similar to the M108, only differing by timing phasing of the cam axles with higher torque and performance at low speeds. It was characterized by the following specifications:

Two carburetors Zenith 35/40 INAT
Compression ratio : 9: 1
Maximum power : 130 hp at 5400 rpm
Maximum torque : 199 Nm at 3600 rpm

applications:

Mercedes-Benz 250 W114 (1968-1972)
Mercedes-Benz 250C W114 (1968-1972)

M114E25 or M114.980

These two second version of the M114 were equipped with Bosch D-Jetronic electronic injection. This version was characterized by the following specifications:

Bosch D-Jetronic electronic fuel injection system
Compression ratio: 9.5: 1
Maximum power: 150 HP at 5500 rpm
Maximum torque: 211 Nm at 4500 rpm

applications:

Mercedes-Benz 250CE W114 (1968-72)

Common M114 Engine Specifications

Cast iron engine block
Aluminum cylinder head
Overhead camshaft
Two valves per cylinder
Seven crankshaft bearings
Engine size: 2.5 liters (2496 cm³)
Displacement: 2496 cc
Bore and stroke: 82 mm × 78.8 mm

Production: Version | Compression | up to Serial #

114.920 10/50,20/60 016313
114.920 12/52,22/62 013677
114.923 10/50,20/60 000964
114.923 12/52,22/62 000045
114.980 10/50,20/60 001588
114.980 12/52,22/62 001417
114.981 10/50,20/60 000015
114.981 12/52,22/62 000002

Years: 1967 1968 1969 1970 1971 1972

This is a Multi Unit Manual that cover the following engines. However, the linked manuals below are recommended for those engines.