Mercedes M189 Petrol Engine Manuals

The Mercedes-Benz M189 Petrol Engine is a 3.0 liter straight six-cylinder motor with a 2,996 cc displacement producing 184 hp, and was produced from 1957 to 1967

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Download: Mercedes Benz M189 Engine Service Manual

Mercedes M189 Engine Repair Manual
Download: 86.9mb, 911 pages, .pdf
Application: W108, W109, W112, W189

USD $19.95

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Multi Unit Engine Manual Applications M108, M127, M129, M189

Download: Mercedes Benz M189 Engine Parts Catalog

Mercedes M189 Exploded Parts Pictures Manual
Download: 6.01mb, 18 pages, .pdf

USD $4.95

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M189 Engine Technical Data

The M189 is a injection variant of the M186, and was produced from 1958 until 1967 with no changes in its 2,996 cc displacement. The M189 3 liter six cylinder provides 160 hp at 5300 rpm and torque of 175 lb.ft at 4200 rpm.

Version Codes: 189.980, 189.981

Version	comp	Horsepower	Torque	Applications	Production
M189 I	8.55	160 hp @ 5300	175 ft.lb @ 4200	300 (300d W189)	1957-1962
M189 III	8.7	160 hp @ 5000	185 ft.lb @ 3800	300SE / SE long (W112)	1961-1963
M189 IV	8.7	160 hp @ 5000	185 ft.lb @ 3800	300 SE Coupé / Cabriolet W112	1962-1963
M189 V	8.8	168 hp @ 5400	183 ft.lb @ 4000	300 SE / SE long W112	1964-1965
M189 VI	8.8	168 hp @ 5400	183 ft.lb @ 4000	300 SE Coupé / Cabriolet W112	1964-1967
M189 VII	8.8	168 hp @ 5400	185 ft.lb @ 4000	300 SE / SEL (W109)	1965
M189 VIII	8.8	168 hp @ 5400	185 ft.lb @ 4000	300 SE / SEL (W109)	1965

Use Careful Consideration Buying a M189

Oil pumps on the M189 have somewhat of a history for oil supply problems, oil volume could fall away although the gauge may still be indicating full pressure.

The M189 engine is the first Mercedes production aluminum engine, and special cylinder liners can move if proper procedures aren't followed when heating and cooling the block casting correctly. This could allow the sleeves to move if the lock bores are stretched.

The third special consideration is corrosion of the engine block steel heat exchanger plate on the left side of the engine. Originally, this plate was coated in a heavy wax to protect it from engine coolant, but over time (and lack of coolant maintenance), this wax coating deteriorates exposing the steel to rust and flake off with these particles landing on the aluminum block below and iron in direct contact with aluminum causes corrosion.

M189 Versions and Applications

The M189 SOHC inline 6 cylinder gasoline motor was installed in several Mercedes vehicles including the W108 300SEb, W109 300SEL, W189 300d, W112 300SE and 300SEL among other applications.

M189 I, 189.980 for vehicles with automatic transmission, and 189.981 for vehicles with bulked synchromesh four speed transmissions

Engine	Production	hp	Series	Model	Years
189.980	1957-1962	160	W189	300d	1957-1962
189.981	1957-1962	160	W189	300d	1957-1962
189.984	1958-1967	160	W112	300SE	1961-1965
189.986	1958-1967	170	W112	300SE	1961-1965
189.984/986	1958-1967	160/170	W112	300SEL	1962-1965
189.985	1958-1967	160	W112	300SE C	1962-1967
189.987	1958-1967	170	W112	300SE C	1962-1967
189.988	1958-1967	170	W109	300SEL	1966-1967
189.989	1958-1967	170	W108	300SEb	1965-1967

Mercedes W109 300SEL M189 Engine

1965-1967 Mercedes-Benz 250 SEb Sedan
1966-1967 Mercedes-Benz 300 SEL LWB
1962-1965 Mercedes-Benz 300 SE Sedan
1963-1965 Mercedes-Benz 300 SE LWB
1957-1962 Mercedes-Benz 300 d Sedan
1958-1962 Mercedes-Benz 300 d Cabriolet
1961-1961 Mercedes-Benz 300 d LWB

Engines Covered in this Multi Unit Manual

While this multi unit manual covers all engines listed here, it is recommended that the linked manuals below be used for specific motors